High Altitude Mask, Training Workout Mask Men to Improve Lung Capacity, 24 Level Breathing Resistance Fitness Mask to Upgrade Endurance, for All Sport: Running, Cardio, Cycling, Gym

This has been very useful for breath training while walking, jogging and cycling, and I've noticed a significant difference in my lung capacity

Works great just what I expected. It makes for a tough workout but that’s the point really. it comes with extra filters and valves to adjust your difficulty. Right size fits comfortably. Low cost. I felt my breathing was improved during my workout. it help increase lung capacity and makes lungs to work hard getting the oxygen. It is perfect mask for people who loves workout.

This mask is great for boosting your training intensity. It made me feel like I couldn’t breathe after only one minute of running in it, so it definitely does the job! The only issue with it I had was the mask kept sliding down my nose and I had to keep pushing it up during my run.

First time using one of these. Training for a marathon where the altitude was 3x hire than my training altitude. Did some multiple training runs with this. Up to a 10 mile training run. Kept is at the least restrictive air flow. I would have to continually adjust it once the sweat started to come through. It was tolerable, considering you are running with something covering your face and increasing the difficulty of your air intake. Think it helped me get through my marathon.

Great workout mask!! The adjustable valves make fine tuning a breeze great seller thanks

Mask doesn’t fit perfectly well but found that if i make the neck strap tight as possible it will do the trick. This mask is absolutely insane and makes me want to quit when i do cardio on the medium setting (which is a good thing). Doing hard cardio on the hardest setting makes me want to pass out (which means it’s doing my job). Would recommend

Works as advertised. I thought it would be uncomfortable but it was not. I used the 4 holed filter for now during intense cardio and I intend to work up slowly. It does force one to control one's breath rate.

I have been using an earlier version of this device for a few years now and I really like what it does(for me). The key is consistency. You must use it on a semi (or regular) basis. Also, I sound like Darth Vader when I’m out riding my bike while training for an event.