Plunge & Barrel

Honolulu's dedicated contrast-therapy studio in Kaka'ako, pairing a barrel sauna running "at temperatures up to 220°F" with cold plunges "as cold as 40°F". Red light therapy, infrared heat and NormaTec compression round out the menu. Newcomers start with a $39 guided contrast class on Sunday afternoons; regulars buy an unlimited contrast membership at $199 a month, or week and month passes at $149 and $249.