By Tanner Garrity The preposterous amount of money that Millennials spend on fitness is well-reported (over $125 a month), with some reports suggesting that the generation will spend more in their lifetime on gym memberships, activewear and connected fitness machines than on higher education). That’s saying something, considering how prohibitively expensive college has gotten in America. But Millennials also tend to devote a ton of time to fitness. Think daily half-hour sessions on the Peloton, hour-long bootcamps booked through ClassPass or two-hour morning runs to train for a marathon. It ca…