9Round is a fitness studio in San Diego offering the most effective 30-minute circuit training workout designed for all fitness levels. Get stronger, physically and mentally, with our trainer-led sessions that combine strength training, functional fitness, and high-intensity interval training (HIIT) with real kickboxing techniques to deliver serious results. With no class times, you can drop in on your schedule and get the benefits of fitness classes without the wait. Burn up to 500 calories, boost endurance, and track your progress with our heart rate training system. Your first workout is FREE—join us at the gym and experience the 9Round difference!