If you’re looking for a down and dirty routine that punches way above its weight when it comes to fat-burning, muscle-strengthening results, high-intensity interval training is where the buck stops. Designed to get your heart rate up to 85-95 percent of its max effort for 15 to 20-minute spurts, HIIT is what you need when you want results but don’t have an hour a day to devote to the gym.
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