According to the Washington Post 16-time Olympic medalist Michael Phelps said Wednesday he had been sleeping â€œat 8,000 feet every nightâ€ for almost a year, after noticing he bounced back from workouts better when he trained at altitude, and therefore trying a device that simulates that.
â€œWeâ€™ve been able to realize after going to Colorado Springs so many times that it is something that helps me recover,â€ Phelps said. â€œThatâ€™s something that is so important to me now being older. I donâ€™t recover as fast as I used to.â€
They are for some reason calling it a hyperbaric chamber, which as far as I know would be a chamber with higher air pressure than what’s normal at sea level, and therefore the exact opposite of altitude. But there you go.