24 Hour Fitness

24 Hour Fitness is one of the world's largest privately owned and operated fitness center chains. 24 Hour Fitness was founded in 1983. From the start, 24 Hour Fitness founder Mark S. Mastrov wanted to create a new way to fitness of life by creating the best in multiple-activity fitness centers. He wanted to make this new type of gym accessible to all people. 32 fitness centers were opened by the end of 1994. Mark Mastrov's pioneering idea of a fitness center that was open 24/7 contributed to the company's success.