About 24 Hour Fitness Headquartered in San Ramon, Calif., 24 Hour Fitness, an innovative leader in the health and fitness industry, serves more than 3 million members in more than 400 clubs worldwide. Founded in 1983 as a one-club operation, 24 Hour Fitness pioneered the concept of making fitness accessible, affordable and a way of life for everyone. Supporting the communities it serves, 24 Hour Fitness sponsors the 2008 U.S. Olympic Teams and the Magic Johnson, Andre Agassi, Shaquille O'Neal and Lance Armstrong foundations.