During the US Open , beneath Arthur Ashe Stadium, is a room so off-limits that it’s actually inside another room that is also very off-limits. In it, champions are recovering in a mind palace of cutting-edge technology. Officially, the only way to get in is with a player’s badge; unofficially, I got one. (Don’t ask.) This is after I spent the majority of the tournament tracking down the $159,500 Ammortal chamber, which claims to reset the nervous system and trigger hours of deep recovery in 25-minute sessions—less time than it takes to wait in line for a $23 Honey Deuce. The chamber combines five modalities, including red-light therapy; near-infrared therapy; pulsed electromagnetic field therapy (PEMF); and vibroacoustic therapy, designed alongside experts who’ve studied human freque

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