HOTWORX - St. Petersburg, FL - 4th Street North is a 24-hour infrared fitness studio and gym offering virtually instructed workouts in patented infrared saunas. Members have unlimited 24/7 access to sessions including hot yoga, Pilates, barre, cycling, HIIT, and other infrared sauna workouts built around HOTWORX's 3D Training approach of heat, infrared energy, and exercise.