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In 1992, Planet Fitness founders Michael and Marc Grondahl acquired a struggling Gold's Gym franchise in Dover, New Hampshire. They eventually closed that original location, opened a gym called Coastal Fitness, and brought on a third partner, Chris Rondeau. In 2002, they purchased the rights to the name Planet Fitness from Rick Berks and renamed their franchise.
Berks had started his own Planet Fitness gym in 1993 in Sunrise, Florida, and eventually expanded it to three clubs, along with a Gold's Gym franchise. The company name was derived from his daughter's school project, which was titled "Fitness Planet."
In the fall of 2013, TSG Consumer Partners LLC became an equity partner in the Planet Fitness franchise. Michael Grondahl, co-founder of Planet Fitness stepped down as CEO, and was succeeded by Chris Rondeau. The company went public on August 6, 2015. In 2023, Rondeau left the company. Colleen Keating became CEO in 2024.