United States Masters Swim is a national membership-operated nonprofit organization that provides membership benefits to nearly 60,000 Masters swimmers across the country. These benefits include insurance, SWIMMER magazine, sanctioned events, and many others. USMS and its 52 Local Masters Swimming Committees (LMSCs) provide direct support to more than 1,500 smaller 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 USMS programs have coaches on deck. Coaches write workouts and provide feedback and instruction.