Whether you’re new to the gym or a fitness expert, you’ve probably heard of high-intensity interval training or HIIT. HIIT is a training style that alternates bursts of high-intensity exercise with short rest periods. For example, a HIIT workout might ask you to sprint for twenty seconds, then walk for ten. During the high-intensity period, you work to elevate your heart rate and challenge your muscles. The brief recovery period allows you a short rest before the next challenge.
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