U.S. Masters Swimming (USMS) is a national membership-operated nonprofit organization, founded in 1970, that provides membership benefits to nearly 60,000 Masters swimmers across the country. USMS exists to promote health & fitness in adults through its 52 Local Masters Swimming Committees (LMSCs) provide direct support to more than 1,500 Masters Swimming clubs and workout groups. Structure and organization of USMS programs vary and are driven by factors such as pool availability, instructor or coach availability, community support, and finances. The majority of locations offering Masters Swimming programs have coaches on deck. Coaches write workouts and provide feedback and instruction. Prospective members and clubs join the USMS organization through their Local Masters Swim Committee (LMSC).