Founded in 1983, 24 Hour Fitness is one of the largest fitness club chains in the United States, serving over four million members in more than 420 clubs. It offers a variety of facilities, such as a club that is open 24 hours a day as well as month-to-month and online memberships. The center provides personal training services, group exercise classes and a selection of strength, cardio and functional training equipment. 24 Hour Fitness has partnerships with prominent consumer brands, including Coca-Cola, Dial and Everlast and Nike.