Marion Roaman and Ruth Zukerman pioneered indoor cycling. Then, one by one, they watched as the multi-billion-dollar boutique fitness empire they helped build — SoulCycle, Flywheel, Peloton — scaled past them on a wave of ambition, betrayal, and "mind, body, soul" branding that concealed a far darker culture underneath. Fat-shaming, racism, sexual misconduct and a Desperate Housewives-grade cast of insider characters populate this high-energy documentary that pulls back the curtain on one of the most improbable industries in American consumer history.

Spin Wars is exactly what a great industry documentary should be: colorful, propulsive and fueled by subjects who have scores to settle and stories to tell. The access is exceptional, the revelations are shocking, and the film crackles with the kinetic energy of the world it is documenting. It benefits enormously from a tight, focused edit that keeps the pace at a spin-class clip, and its gallery of insiders will have audiences gasp and cringe in turn. A natural for an audience hungry for the next great toxic-startup story, and a thoroughly entertaining ride from the first pedal stroke to the last.—Jarod Neece