Though now spread over the United States, Crunch gym started in a basement-level aerobics studio in New York City. Despite the humble location, the gym's founders aspired to foster a workout environment that would keep members exercising through entertainment and not shouting from drill-sergeant-like trainers. Their idea was to host fitness classes with offbeat touches, including hip-hop aerobics featuring a live rapper and coed action wrestling.

Twenty years later, Crunch gyms' fitness classes still stray from the beaten path. Body Web with TRX sessions suspend members from a pillar, where they complete gravity-defying maneuvers with help from strong resistance ropes. In Bosu Bootcamp, every exercise is completed on an apparatus that is part balance ball and part core board.