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I later learn it’s called an altitude-simulation tent, and when the generator is hooked up it sucks the O2 out of the tent and helps the body produce more red blood cells. It makes your cardio system work like you’re sleeping on top of Mount Everest.
I’d have to bet I’m the only guy on the Upper West Side of NYC with an inflatable raft, an oxygen deprivation tank, a tent, and a SEAL in his apartment. I get into my bed and open the window in our room. I suck in the cold NY air coming into my apartment off Central Park. It feels great. As I fall asleep I think about the lack of oxygen in SEAL’s tent and again think to myself… I’m such a pussy.
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Jesse Itzler (Living with a SEAL: 31 Days Training with the Toughest Man on the Planet)