Hotworx opened a fitness studio May 18 at 2150 E. Palm Valley Blvd., Ste. 400, Round Rock. Hotworx offers a 24-hour virtually instructed exercise program that uses infrared saunas. Users complete isometric workouts or high-intensity interval training sessions while infrared heat penetrates the body. 512-713-6501. https://hotworx.net/studio/roundrock