This breathing trainer is really good! I’ve been using it while training for basketball and running, and I can definitely feel a difference in my endurance. Great tool for improving performance — highly recommend! (Make sure to inhale and exhale slowly)

This device has been a nice addition to my life. I believe I am using it the correct way and if I am, it seems pretty easy! I feel when I have used it , my breathing has improved some what.. which is a plus.
I do like how the design is.. the simplicity is everything! Also, because it is pretty small, i feel as if i take it anywhere!

I bought this to help my boys maintain their breathing training with wrestling and running. So far they like it and take it to practice and use on conditioning days.