Great product. I have no idea how it works, but it works. I'm really happy with it. My 5k time has gone down from 35 to a consistent 28 minutes. It might not sound like much, but for me, it's progress. I use it for 10 minutes every day at home, just to breathe. Good quality. It has a valve that creates some resistance when breathing. The mouthpiece is very comfortable.

I use it during training to control my breathing. You have to learn to control your breathing during games so you don't get out of breath. This device helps me a lot with that and has improved my performance. I've increased my goals from 7 to 24 per season—with 8 assists. It's definitely helped me.

I'm 19 and used to vape a lot, which completely ruined my stamina. I always got out of breath quickly during soccer. After 6 days of using the device, I'm already noticing a difference. I do the breathing exercises every day, and it's really working. My stamina is significantly improved, and if I keep going like this, I'll be fitter than many of my friends. If your stamina is ruined by vaping or something else—buy it!

Very good quality, fast delivery. I've been using it for a week and already have better control over my breathing during training. Makes absolute sense for anyone who wants to get fitter.

Großartiges Produkt. Keine Ahnung wie es funktioniert, aber es funktioniert. Ich bin wirklich zufrieden. Meine 5km Zeit ist von 31/32 auf konstant 28 Minuten runter. Klingt vielleicht nicht nach viel, aber für mich ist es ein Fortschritt. Ich benutze es täglich 10 Minuten zu Hause, einfach zum Atmen. Gute Qualität. Es hat ein Ventil, das etwas Widerstand beim Atmen erzeugt. Das Mundstück ist sehr bequem.