Industry Pioneer Joins Forces with LongRange Capital to Acquire 24 Hour Fitness. New Owners to Fuel Investment and Expand Business Strength and Success.24 Hour Fitness today announced that company founder and fitness industry trailblazer Mark Mastrov is returning as Owner and Executive Chair to accelerate the brand into its next phase of innovation and expansion. LongRange Capital and Mastrov have partnered to acquire 24 Hour Fitness and support the company’s executive leadership team led by President and CEO Karl Sanft.
Mastrov founded 24 Hour Fitness, growing it from a single location to 420 clubs and 4.5 million members, before selling the company in 2005. He then went on to lead the purchase of Crunch Fitness in 2009, expanding it from several locations to 550 owned and franchised clubs before it was sold in 2025. Widely regarded as the pioneer of the modern fitness culture, Mastrov has helped reshape the industry through four decades of worldwide development. With Mastrov’s return, he and Sanft are united behind a shared vision to propel the company and industry into its most ambitious chapter yet.
This announcement marks a pivotal moment for 24 Hour Fitness, which is experiencing one of the strongest growth periods in its history. Fueled by renewed demand for health and wellness, the company has invested in a nationwide slate of remodeled clubs and a wave of new experiences that allow each member to accomplish their personal wellness goals. The brand employs approximately 7,000 team members and supports more than 113 million workouts each year, ranking in the top three among company-owned fitness clubs in the country.