Forget the Jazzercise and spinning classes, a worldwide survey by the American College of Sports Medicine reports that the most popular fitness trend in 2014 will be H.I.I.T. — High Intensity Interval Training.

 

From thepostgame.com:
The Hottest Workout of 2014

The Hottest Workout of 2014 was last modified: January 3rd, 2014 by Interesting Articles

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