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A 15-minute full body HIIT workout — no equipment required Improve heart health, increase fat loss and strengthen and tone your muscles in just 15 minutes a day. Chances are you’ve at least heard of high-intensity interval training (HIIT) , if not participated in a workout yourself. And there’s a reason why HIIT workouts are so popular — science proves that they work. Workouts that alternate between short, but intense, bursts of exercise (where you go all out for a period of time) and less intense active recovery, have been shown to be more effective for heart health, fat loss and strength gain than traditional cardio and strength training. And the kicker? You get all those results in less time. Compared to longer stretches of moderate-intensity running, cycling, or other aerobic exercises, studies show show that HIIT improves cardio fitness nearly twice as much among people with heart disease. In terms of strength improvements in the body, not only have HIIT