HOTWORX - O'Fallon, MO is a 24-hour infrared fitness studio and gym offering virtually instructed sauna-based workouts. Members have unlimited 24-hour access to sessions including hot yoga, Pilates, barre, cycling, HIIT, and other fitness formats built around HOTWORX's 3D Training approach of heat, infrared energy, and exercise. The studio is located on Highway K in O'Fallon, between Interstate 70 and 364.