Key to High Intensity Interval Training found outside comfort zone

February 2, 2015 1:11 PM

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Key to High Intensity Interval Training found outside comfort zone

NEW YORK (Reuters) - With High Intensity Interval Training (HIIT), which consists of short bursts of intensive activity followed by short periods of recovery, fitness experts say the harder the push, the greater the reward.

HIIT can blast calories, build muscle and boost endurance with impressive efficiency in just 20 minutes a day, but the catch is finding the right level of intensity outside the comfort zone, fitness trainers say.

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