Try this no-equipment HIIT workout. If you haven't tried HIIT by now, find out why high-intensity interval training can burn more fat in less time. There is not a single repeat exercise in this HIIT cardio workout, 15 exercises only. Fast moving intervals of cardio bursts and strength training will have your heart pumping. It's the ultimate workout for people with little time who want results. Burn 156-237 calories.