to top 10 table

Best Training Masks Reviewed & Rated for Quality

last updated: Oct 11, 2020
Training can be tedious if you really want to improve—but training masks can help you push yourself further if you incorporate them into your routines.

Whether you need to increase your endurance to gain an edge in your next competition, or you just want to mimic high-altitude training, you will benefit a great deal from these masks. The best training masks will restrict airflow, which will simulate the difficult breathing conditions you encounter in higher elevations. Regardless of if you have or haven’t tried this method before, if you are looking for a challenge this is it.

Surprisingly, there are lots of choices out there, so take a look at our list of top-rated workout masks below!

In a Hurry? The test winner after 11 hrs of research

icon
Training Mask 3.0
98.2/100 our score
Fit
99
Materials
97
Weather Resistance
99
Style
98
Bottom Line
98
Training Mask 3.0
Why is it better?

Multi-level airflow restriction

Airtight construction

Aesthetic and sleek design

Comes with carrying case

Lightweight

1-year warranty with registration

Good customer service response

In a Hurry? Editors choice:
Training Mask 3.0
Test Winner: Training Mask 3.0
Amazon Link
Researched Sources
11
Researched Sources
Reviews Considered
2.1k
Reviews Considered
Hours Researching
11
Hours Researching
Products Evaluated
16
Products Evaluated
Sorting Options
Fit Materials Weather Resistance Style Bottom Line By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
98.2
Fit
99 %
Materials
97 %
Weather Resistance
99 %
Style
98 %
Bottom Line
98 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96
Fit
97 %
Materials
96 %
Weather Resistance
96 %
Style
95 %
Bottom Line
96 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94
Fit
95 %
Materials
94 %
Weather Resistance
93 %
Style
94 %
Bottom Line
94 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92
Fit
85 %
Materials
90 %
Weather Resistance
99 %
Style
95 %
Bottom Line
91 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.8
Fit
90 %
Materials
91 %
Weather Resistance
90 %
Style
93 %
Bottom Line
90 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.6
Fit
88 %
Materials
89 %
Weather Resistance
87 %
Style
89 %
Bottom Line
90 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.6
Fit
85 %
Materials
86 %
Weather Resistance
86 %
Style
85 %
Bottom Line
86 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
82
Fit
82 %
Materials
81 %
Weather Resistance
83 %
Style
82 %
Bottom Line
82 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
80
Fit
80 %
Materials
82 %
Weather Resistance
79 %
Style
79 %
Bottom Line
80 %
Price Comparison Last Updated (01.12.20)
Amazon Link
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
78
Fit
79 %
Materials
78 %
Weather Resistance
78 %
Style
77 %
Bottom Line
78 %
Price Comparison Last Updated (01.12.20)
Amazon Link

Top 10 Workout Masks

1. Training Mask 3.0

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
98.2
Training Mask 3.0
Training Mask 3.0 features
Amazon Link
Fit
99
Materials
97
Weather Resistance
99
Style
98
Bottom Line
98
best offer for today
Amazon Link
Pros:

Multi-level airflow restriction

Airtight construction

Aesthetic and sleek design

Comes with carrying case

Lightweight

1-year warranty with registration

Good customer service response

Cons:

Outer sleeve is not the most durable

Inaccurate size measurements

The Training Mask 3.0 is the newest installation in a line of masks from the company that has paved the way for this type of gear. This is a sleek follow up to the Training Mask 2.0 and is one of the best masks on the market.

Read more

Unfortunately, it is not adjustable, but there are several different sizes to choose from so you don’t have to worry about the issues that come with “one size fits all” designs.

The composite rubber mask covers a generous area so as not to be constricting while also not being overbearing or bulky. An outer sleeve keeps the mask piece snug and is breathable and soft, definitely preferable to other systems that use excessive elastic straps.

This mask offers an easy to control dial and several different levels of airflow restriction to allow you to slowly decrease the level of oxygen you’ll be using while training. It’s a great option for beginners as well as those familiar with using workout masks. The rubber molded mask creates an airtight seal and works well with the shroud plate that regulates your airflow.

Not only is this mask super functional in its construction, but it also looks fantastic. It has a strong aesthetic without being ultra bulky or obtrusive and is branded with the modern, sleek Training Mask logo.

The 3.0 is more expensive than other options on our list, but is currently discounted and is definitely worth the initial investment. This is one of the best masks you could hope to find.

2. FITGAME

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
96
FITGAME Workout Mask
FITGAME Workout Mask specs
Amazon Link
Fit
97
Materials
96
Weather Resistance
96
Style
95
Bottom Line
96
best offer for today
Amazon Link
Pros:

24 intensity levels

Universal fit

Reinforced stitching

Cons:

Slightly expensive

Strong rubber smell

What we liked most about this design from FITGAME is that it boasts a comfortable fit, and allows you to adjust the resistance levels to tweak your workouts as you see fit. It is composed of quality materials that hug your face without digging into your skin when out on long runs.

Read more

The very first thing that we wanted to discuss is that it is built with 24 resistance levels, which allows users to slowly turn up the intensity. When first starting out, you can set it at the lowest setting to get used to working your lungs harder. As you get used to this device, you are able to adjust the intensity to the right setting for your needs.

It boasts a universal size that is perfect for both men and women. Instead of using stiff materials for the band, it is made from comfortable stretchy materials that also work to wick away sweat. It also has reinforced stitching that resists tearing over the years of continued use.

If you are on the market for something that is composed of strong and durable materials, this design from FITGAME is a great choice. We love that users can adjust the intensity levels to fit their specific fitness needs, and boasts a fit that accommodates all sizes and shapes of faces.

3. VEOXLINE

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94
VEOXLINE Training Mask
VEOXLINE Training Mask specs
Amazon Link
Fit
95
Materials
94
Weather Resistance
93
Style
94
Bottom Line
94
best offer for today
Amazon Link
Pros:

Easy to clean

Stay in place

Adjustable

Cons:

Headband gets hot

If you are worried about hard and stiff materials digging into your face, this design from 2 VEOXLINE is made from soft and comfortable materials that stay put as you train. We love that it boasts various resistance levels so you can slowly build up to higher difficulties. Users love that this design fits comfortably on both men and women, and doesn’t shift around as you jump around.

Read more

The most notable feature of this design is that it boasts a design that stays put no matter how much you move around. It has a comfortable bad that fits on the crown of your head as well as the base of your neck to fit securely. It is made from soft materials as well that won’t dig into your skin.

We also like that this design offers up an impressive 16 resistance levels. This allows users to start out slowly and build up to harder difficulties as their lungs get stronger. It also has a headband that is able to be removed for quick and easy cleaning when it starts to smell a little ripe.

This design from VEOXLINE is a great option if you plan on doing a lot of moving. It is a great choice for running, cross-training, climbing, cycling, or playing sports. Plus, it comes in at a slightly affordable price point that makes it worth checking out.

4. Dimok

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
92
Dimok
Dimok specs
Amazon Link
Fit
85
Materials
90
Weather Resistance
99
Style
95
Bottom Line
91
best offer for today
Amazon Link
Pros:

16 resistance levels

Secure fit

Great Price

Can switch resistance during your workouts

Great for all levels

Cons:

Not compatible with anyone that weighs less than 155 pounds

This is a great mask for runners and any type of HIIT workout. While it is not ideal for contact sports, if you don't partake in those that won't matter much, will it?

Read more

This training mask is designed for individuals between 155 pounds and 220 pounds and can be used for many sports and athletic activities--although some users have experienced some issues when they use it in contact sports.

This mask is made of flexible, lightweight, and breathable material. It is durable and designed to last, thanks to the use of high-quality materials--so you can definitely count on this mask.

It offers a total of 16 resistance levels--yes, 16! It is perfect for anyone just starting out that wants to work their way up as well as for more experienced users who want to more flexibility when dictating the intensity of their resistance levels. This mask allows you to change the resistance level mid workout--so you can adjust as you go!

This is a really versatile mask. While some users have had some issues with contact sports, it is typically because they have smaller faces or did not securely attach them so their sparring partners were able to move it or knock it around. Overall, it is a great pick, at a great price!

5. Training Mask 2.0

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90.8
Training Mask 2.0
Training Mask 2.0 specs
Amazon Link
Fit
90
Materials
91
Weather Resistance
90
Style
93
Bottom Line
90
best offer for today
Amazon Link
Pros:

Great tool to strengthen diaphragm

Includes a head strap

Multiple resistance levels

All your valves are included

Easy to follow, detailed user guide included

Cons:

Sweat can sometimes effect the seal

Not for the use with kids

The Training Mask 2.0 is the one-size-fits-all mask of choice that can accommodate the widest amount of individuals who are interested in improving their fitness and endurance. This mask in the 2.0 edition has been redesigned to encompass the most practical, comfortable and progressive altitude workout mask on the market. You have the ability to set your training levels in increments of 3000, 6000, 9000, 12000, 15000 and 18000 feet. You are getting a ton of versatility and performance with this mask.

Read more

Its secure fit allows for steady breathing, which is important to train yourself to breathe more efficiently and deeply when you aren’t using the aid of your mask. You can easily train your body to workout in the best possible way so that when you exercising, you will still see the benefits without using the mask.

A common question is how long will it take to train with this mask to notice an improvement? It is different for everyone, as each person’s body has varying abilities to adapt and strengthen. Don’t be surprised, however, if you are training consistently with it and in as little as two weeks see an impressive improvement in your abilities.

This mask will get the job done by improving your efficiency while also doing its job efficiently. A double positive. You will be able to improve your breathing when you are engaging in cardiovascular activity.

You don’t have to be training for a race in the Rockies to benefit from using this mask. Your regular walker to extreme racer will benefit from an overall dramatic improvement in their health and fitness. For elite athletes whose focus is to improve their productivity and efficiency. Imagine getting the same benefits you’d get from a 60-minute workout in 20 minutes. Pretty amazing.

6. Vikingstrength

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
88.6
Vikingstrength
Vikingstrength specs
Amazon Link
Fit
88
Materials
89
Weather Resistance
87
Style
89
Bottom Line
90
best offer for today
Amazon Link
Pros:

16 resistance levels

100% satisfaction guarantee

Includes a storage bag

Great for men or women

Lightweight, 2.8 oz

Cons:

Only comes with two replacement pieces for breathing chambers

Lever to adjust resistance is thin

Vikingstrength provides you with an altitude training mask that is specifically for the ultimate athlete. This mask is no joke and is all about performance, productivity and skill refining. When you are ready to take your training to the next level and develop yourself as an elite athlete, this is the mask you use.

Read more

This is a super light mask so it’s not going to way any athlete down during the most intense workouts. It will also not be an annoying distraction from focusing on your workout, by moving around and feeling awkward on your face. The medical silicone will hold up to heavy workouts and keep you healthy with repetitive use.

The material is awesome, it is breathable and lightweight, and it has such a great feel on the face. Velcro straps are the tops for any easy adjustments you want to make.

This mask is very easy to maintain and clean, which is what you’d want from something you are going to be using hard. You can switch through the resistance levels you want with the mask on, so no interrupting your workouts for that anymore.

7. NextGen

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
85.6
NextGen Workout Altitude Training Mask
NextGen Workout Altitude Training Mask specs
Amazon Link
Fit
85
Materials
86
Weather Resistance
86
Style
85
Bottom Line
86
best offer for today
Amazon Link
Pros:

Hard carrying case included

Stay put while working out

Adjustable

Cons:

Slightly expensive

This design from NextGen costs a little bit more, but it also comes with additional tools to help you get the most out of your mask! This kit includes a durable mask, a hard shell carrying case for easy travel, and a cleaning spray with a cloth to keep it smelling fresh (as well as extend its life span). The design of this option is perfect not only for running, but any activity where you run and jump a lot.

Read more

The very first thing that we noticed about this option is that it has a wide headband that really sticks to your head without shifting around. The band hugs the side of your face and runs along the top of your crown and the base of your neck for a super-secure fit. We also like that it comes with a cleaning solution to give it a quick cleaning as needed.

This design also includes a hardcover case that makes it easy to take with you on the go. Some like to pack it into their suitcase, or you can even clip it onto a backpack while out on the go for easy access. By including a hard case, it reduces the risk that it will become smashed when traveling.

For workouts that require a lot of movement, this is a great option that stays put while you workout. Users love that it comes with a few accessories to keep it clean and pack it away for your next adventure. Plus, it is incredibly easy to wash when needed.

8. FDBRO

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
82
FDBRO Training Mask Fitness for Running
FDBRO Training Mask Fitness for Running specs
Amazon Link
Fit
82
Materials
81
Weather Resistance
83
Style
82
Bottom Line
82
best offer for today
Amazon Link
Pros:

Easy to adjust

Various sizes available

Unique style

Cons:

Fewer levels of resistance

Looking for something that boasts a few different styles? This option from FDBRO comes in a few different designs that are sure to generate a few jealous looks while out on the trails. We also love that it comes in a variety of sizes so you can be sure to get the fit that fits your face perfectly.

Read more

Unlike some of the other options that we have seen, this design from FDBRO only offers six levels of resistance. However, previous users have found that changing the resistance is quick and easy, and can be accomplished without even taking off the device. The lowest level is for beginners, and the higher levels are for veteran runners.

We also like that this design also fits your head comfortably, and doesn’t shift around too much. It is offered in sizes that include small, medium, and large. Be sure to reference the sizing chart so you can pick a style that fits your head like a glove!

If you are in the market for something that boasts a sleek style that is bound to generate quite a few compliments, this option is a great choice. Not only is it easy to use and effective, but it also clocks in at a price point that won’t break the bank.

9. Sparthos

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
80
Sparthos
Sparthos specs
Amazon Link
Fit
80
Materials
82
Weather Resistance
79
Style
79
Bottom Line
80
best offer for today
Amazon Link
Pros:

3 sizes to choose from

Quick flip airflow valves

16 breathing levels

Restricted exhaling

Restricted inhaling

Cons:

Watch sizing, it fits a bit large

Could use more adjustable features for smaller faces

16 breathing levels to push your workouts and your body to the extreme, a sleek design and a pleasing feel with their ergonomic fit, Sparthos is a top-level training mask.

Read more

The slip-resistant design will fit you just right, as it forms to your face for the most ergonomic fit. You can comfortably place it over your face and get into a solid workout without worrying your sweat will displace this mask while you are wearing it. The straps alone were specifically designed to hold on with a snug feel that is anything but awkward, especially when you are hitting high speeds.

Made with high quality and durable materials. it is built to last and will hold up in the long run. You won’t find many masks on the market that provide you the option of advancement through a whopping 16 levels of breathability. Don’t be scared off by these extra levels of intensity, all it takes is one easy click to change between levels.

With so many options in levels of breathing, you can be overcoming a recovery block just as easy as you can train to improve your health.

10. VO2MAX

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
78
VO2MAX Training Mask
VO2MAX Training Mask  specs
Amazon Link
Fit
79
Materials
78
Weather Resistance
78
Style
77
Bottom Line
78
best offer for today
Amazon Link
Pros:

Affordable

Stay in place

Comfortable fit

Cons:

Difficult to adjust

If you are looking for something that is a little more affordable, this design from VO2MAX is worth checking out. We love that it is made from quality materials that hold up well over time, and is made to fit comfortably on your face. Plus, it offers an impressive 32 levels of resistance, making it a great design for newbies and veterans.

Read more

What we like about this design is that it boasts a super comfortable and breathable headband that stays in place as you train. It is a cinch to take off and throw into the washing machine when it starts to smell a little ripe as well. The wide straps help to distribute the pressure to avoid it digging into your skin during long training sessions.

It also boasts a grip in the front as well that prevents it from slipping down your nose like some of the other designs out there on the market. Users find that it is easy to adjust the oxygen flow of this design without even taking off the mask.

This is a great design for not only for runners but for activities such as cross-training and sports as well. It has a few backup features to ensure that this device stays in place, no matter how hard you train. Plus, it comes in at an affordable price point that makes it worth checking out.

Criteria Used for Evaluation

Fit

Since you’ll be using a training mask like the ones above while you’re working out, you’ll be wearing it during periods of high stress on your body.

You want to make sure that everything you wear when you exercise or compete is functional and fits well so as to not hinder your ability to move and perform. You may have to do some measuring so that you can use the fitting guides that many brands will provide. Always check the instructions provided on how to measure and select the best fit for your body type and shape.

It’s also a good idea to check other real customer reviews to see if there are common fitting issues or frequent defects that people had problems with. This is exactly what we did while composing our own list of the best workout masks, so you can take note of any major or common fit issues while browsing our selection.

Materials

The materials that are used in a training mask are very important, sometimes making the difference between a great piece of training gear and an impractical tool you wish you hadn’t bought in the first place.

For example, when you workout you sweat, and if your mask is made of materials that don’t help to wick moisture or keep a snug fit you could lose the seal that keeps your mask properly adjusted to your face. Not only will this be counterproductive to why you are wearing your mask because it limits the ability of the mask to work properly, but it is also annoying.

Can you imagine having to fiddle with your mask multiple times throughout your workouts to ensure it is fitting and sealing properly? It’s not likely you are going to keep using it if you’re having to waste your time messing around with it.  

We looked at masks that were flexible, permeable and had great moisture-wicking properties to ensure once you get your mask on the seal and placement will stay in the place where you want it to be. We also looked for masks that were made of materials that are antimicrobial and easy to clean.

Materials that are easy to clean for many, many more future use makes your mask work the best for you and keeps bacteria away from sensitive areas like your face and mouth.

Weather Resistance

If you aren’t already adjusted to efficiently working out in the thinner air of high altitude environments, then it will take some time to build up that assimilation.

You can physically take yourself to such environments to train in a real-world situation. For most people, this is not a feasible option. Training masks claim that using their technologies you can simulate training at high altitudes and help you to be more efficient and effective.  

Just like training in the Rockies, your body will need time to transition to be able to function properly with the added stress on your respiratory system. The multiples levels allow you to slowly progress at your own personal rate in a safe amount of time that is customized to you. You can also customize the amount of resistance you use depending on what type of activity you are doing, which is helpful because the body changes how it works and functions within different activities.

This also changes your breathing patterns, so the flexibility to adjust your mask with your natural breathing adjustment is a much-needed feature. Dial up or down the intensity based on what your requirement may be.

Style

The ease of which you are able to change resistance levels is worth paying attention to because if you have to take off your mask every time you want to change it will not just be annoying but it is really not practical.

We were looking for masks that had systems designed so they can be easily changed while you workout.

You will be washing your mask, so that is a feature that is important in the design. For some masks you will have to take them apart and put back together to do so, it was important that the masks we reviewed made that process easy. No one wants to waste their time on frustrating construction projects.

Many of the masks use filters and valves. These will require replacing the filters from time to time.

Bottom Line

Some athletes can also get other benefits from using a workout mask, depending on their sport.

Many MMA fighters will tell you that they like to wear the masks when they are training because it helps them experience and react to what it feels like to have your opponent restrict your airflow and ability to breathe.  That is not a bad thing to simulate considering that is something that can really throw anyone off.

Expert Interviews & Opinions

Most Important Criteria (According to our experts opinion)
Sort criterias acording to:
Experts Opinion Editors Opinion Users Opinion By Default
Click on a to rate the most important criteria:
#1
Fit
Rate This Criteria as Most Important
#2
Materials
Rate This Criteria as Most Important
#3
Weather Resistance
Rate This Criteria as Most Important
#4
Bottom Line
Rate This Criteria as Most Important
#5
Style
Rate This Criteria as Most Important
Fit

These types of masks differ from other face masks meant to filter the air you’re breathing that have become popular for cyclists and outdoors enthusiasts. Make sure there is a correct fit because it does restrict air.

The Debate

While there is quite a bit of debate out there as to the legitimacy of these masks and whether or not they actually do what they say, one thing is for sure: there are a number of athletes who have used them and claim to really feel a difference in their performance.

Other Factors to Consider

Effectiveness

Training masks can have a large effect on the way your respiratory system works depending on what kind of exercises you’ll be doing. It’s probably not a good idea to wear these types of masks while doing things like weight training and anaerobic exercises. For the most benefit, use training masks while doing cardio workouts.

Make sure to thoroughly research the mask you are considering to ensure you are getting something that will work for you. If you have never used one of these masks you will need to ensure that it offers settings that will go easy on you. Some of these masks can be adjusted during your workouts, which is a great option to consider if you want to get the most out of your mask.

Breathability

If you are specifically training because you are going to be exercising or competing at a high altitude, you don’t want to only rely on using a training mask alone to help condition your body for that change in altitude. Training masks only limit your airflow and don’t simulate all of the other changes hypoxic (low oxygen) and high-altitude environments can have on your body.

You should prepare yourself and work your schedule so that you can arrive early enough, roughly two weeks before to grant your body partial acclimatization ability. Then you can get some training in and see how you are able to perform in the actual environment. This will help you better figure out how to regulate your physical activity and intensity with your surroundings.

Frequently Asked Questions

q: What are some of the benefits of wearing a training mask?

a:

The reason that you breathe heavily when you run is that your body is trying to meet the sudden oxygen demand created when working your muscles. When you wear a mask, your heart and lungs need to work harder to pump oxygen to your body and in turn, helps to strengthen these systems. When you take your mask off for race day, you will find that you don’t have to fight so hard for oxygen.

It is similar to wearing ankle weights around your legs as you train each day. These weights make your stride more labored, but also work to make your muscles stronger. When you go for a run without the weights, each step seems effortless like you are running on the moon!

q: Will using a training mask help with weight loss?

a:

While some studies are exploring how high altitudes might contribute to weight loss, there is no solid scientific evidence to suggest that hypoxic workouts are inherently better for weight loss specifically. The strengthening of respiratory systems and the exercise itself are the most likely to be helpful in losing weight, but using a training mask isn’t any more effective beyond the tried and true method of healthy eating and frequent exercise.  

q: How does your body respond to higher altitudes?

a:

Air is much thinner when you reach higher altitudes. So your body needs to be more efficient at bringing in the right amount of oxygen. The way it does this is by producing more red blood cells which improve your body’s ability to carry oxygen throughout. Wearing a training mask doesn’t completely simulate the effect of high altitudes because it doesn’t affect the way your blood reacts to the hypoxic environment.

q: What is the right amount of resistance levels for me?

a:

The masks on our list provide various amounts of resistance levels--most range from 4-16 different levels. If you want a really versatile mask that allows you to adjust it according to your needs on any given day--or if you are a beginner who wants to slowly build your way up--you will want to choose one with the most levels available. If you have had some experience with these masks, you can go with fewer resistance levels--or if you can handle jumping up the intensity with no room in between, those with lower resistance levels options are also effective.

q: Do I have to stick to the weight limit?

a:

Yes, you need to stick to the weight limit stated by the manufacturer. This is important because the mask is designed for individuals who fit the weight prescribed, and unintended injury can occur if you don't abide by the suggested weight.

Sources

  1. Bodybuilding.com, Do Elevation Masks Work?, Bodybuilding Nutrition and Fitness Source
  2. McKenzie, D.C., Respiratory physiology, adaptations to high-level exercise, British Journal of Sports Medicine
  3. PubMed, Training Match Intensities at High Altitude in Highly-Trained Young Soccer Players, Research Publication
  4. Levine, B.D., Intermittent hypoxic training: fact and fancy, High Altitude Medicine & Biology