... College of Sports Medicine survey, the new top fitness trends for 2014 are high-intensity interval training like P90X and Cross Fit, which involve shorts spurts of intense anaerobic exercises with lower-intensity periods of recovery. P90X, also ...
http://www.medicaldaily.com/top-fitness-trends-2014-high-intensity-interval-training-popular-its-short-time-complete-261078
http://www.medicaldaily.com/top-fitness-trends-2014-high-intensity-interval-training-popular-its-short-time-complete-261078
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