5. HIIT is more time-efficient
We know: You already know these workouts are more efficient than any other kind. But, there’s science to back up just how crazy-efficient they are. “You can get the same, if not greater, results in half the time of low-intensity longer-duration workout sessions,” says Holland, citing a 2013 study in the Journal of Physiology. That study found that sedentary men who did 40-60 minutes of cycling at 65% of their max five times a week, and those who did sprint interval training for less than 12 minutes each time three times a week saw similar results, including reduced aortic stiffness and increased insulin sensitivity.
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