AustinL911
Lil-Rokslider
- Joined
- May 24, 2016
- Messages
- 291
Those things are a gimmick and won't prepare your body for altitude in any way, shape, or form. You need to live in either a hypoxic (<21% Oxygen) and/or a hypobaric (~ <600mmHg; 760mmHg is @ sea-level) environment for an extended period of time (about a week, give or take). The only benefit those masks MIGHT provide is strengthening your diaphragm.