Interval Vs. Endurance Training

From CBSNews.com

A new study suggests that doing intense interval training for 20 minutes three times a week is just as effective at boosting strength and endurance as five to six hours of jogging or moderate cycling.

It's a technique that's been used for years by sports teams and athletes. But is it useful to an average overweight person? Probably not. It doesn't burn many calories.

And it requires so much suffering that you're almost destined to quit, one expert said.

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