Category: HIIT

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High-intensity interval training (HIIT) promises big benefits—lean-muscle definition, high-calorie burn, greater aerobic capacity—in a short amount of time, but it comes at a cost. You have to work for it. Intense bursts of effort are followed by short rest periods to keep your heart hammering and metabolism torching calories long after the workout is over….

High-intensity interval training, or HIIT, is an insanely efficient way to build muscle, improve conditioning, and score a killer total-body workout in no time flat. And good news: You may already be doing some of the following moves—the five best HIIT exercises of all time—as part of your current training program. It’s just that you’re…