Equinox, believing boxing-inspired group fitness will become the next big thing, just picked up a “significant minority” stake in Rumble, a 12-month-old fitness company with a boxing mentality. Backed by Sylvester Stallone and Justin Bieber — and with a cult following that incudes Selena Gomez, Kendall Jenner, Hailey Baldwin, Jason Derulo, David Beckham and Kevin...
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Source: New York Post