24 Hour Fitness Worldwide, the world’s largest privately owned and operated fitness center chain, began as a one-club operation in 1983. From the start, 24 Hour Fitness Worldwide Chairman, CEO and visionary, Mark S. Mastrov, had a vision to make fitness a way of life by creating the ultimate in multi-sport fitness centers and making them affordable and accessible to people of all abilities and fitness levels.

Throughout its growth, 24 Hour Fitness has held fast to Mastrov’s founding vision: to make fitness a way of life for everyone.