High-intensity interval training (HIIT) is a workout that combines short periods of intense or explosive anaerobic exercise with brief recovery periods. HIIT workouts improve athletic capacity and overall cardiac output, as well as boost your metabolism. Research has shown that it can produce significant reductions in body fat and reduce the risk of cardiovascular disease. Both cardio and resistance training is part of a HIIT workout, where Cardio exercise gets your heart rate up and keeps it there while Resistance training increases muscle strength and endurance. AT F45, our HIIT workouts are tailored to your fitness level.