If you're holding too much weight, 24 Hour Fitness Worldwide has the solution. It owns and operates more than 400 fitness centers that offer aerobic, cardiovascular, and weight lifting activities to the company's more than 3.5 million members. Some facilities also feature squash, racquetball, and basketball courts; swimming pools; steam and sauna rooms; tanning rooms; and whirlpools. It is one of the only fitness chains open 24 hours a day. The centers are located in more than 15 states in the US, as well as throughout Asia. (It has some 15 clubs in Hong Kong, Malaysia, Singapore, and Taiwan). Forstmann Little & Co owns 24 Hour Fitness, which was founded in 1983.