The 13th Austin-area location of Orangetheory Fitness opened Jan. 28 in Domain Northside at 3100 Esperanza Crossing, Ste. 118, Austin. The fitness facility offers high-intensity interval training combined with heart rate monitors. The 60-minute classes incorporate intervals of cardiovascular and strength training using a variety of equipment, including treadmills, rowing machines and free weights. 512-807-0444. http://domain.orangetheoryfitness.com