Equinox CEO Niki Leondakis sits with her eyes closed, breathing deeply, hands folded together. She bows to the teacher: Namaste. Clad head-to-toe in Lululemon and enviably fit, Leondakis looks like any other gym-goer in the crowded yoga class in downtown Manhattan. There’s no reason to suspect—and indeed no one around her does—that moments ago she was sitting in the boardroom upstairs, discussing the future of the company that operates this gym, whose industry teeters on the brink of technological disruption.