For Will Ahmed, the road to building a $10.1 billion fitness startup began with what he calls "the ultimate betrayal." The perpetrator? His own body. Launched in 2012, the Boston-based fitness wearables company now has more than 2.7 million users across the globe. Those customers use Whoop's screen-free wrist devices to track a wide range of biometric data around the clock, from sleep quality to how their bodies perform during exercise and recovery. The company achieved its 11-figure valuation