You may want to also check out:
In order to perform at your best as an athlete, you need to work on your breathing all the time. The Bas Rutten O2Trainer is a respiratory training device that increases your lung function, improves your breathing habits, and increases red blood cell concentration.
This breathing trainer is ideal for high altitude and power training. It comes with caps 1mm to 14mm to adjust the resistance. You can easily fit it in any bag.
*some of our articles have aff links. Please read our disclaimer on how we fund Exxponent.
