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@Sainsburys_Ed
Have since discovered its called a hypoxic chamber
I'm using it because I've been offered a free session but have to do it on Sunday.
Essentially its the same as training at altitude, I'm not sure one session will have a huge effect, but at the same time it isn't going to hurt (apart from at the time) basically less oxygen in the room, cv system has to work harder to get the same results, theoretically would increaase heamoglobin count, but I think this is a gradual thing over time.
I'll use it once, I'm not going to pay £120 per month to use it though!