Julie's Health Club: P90X exercise program 'confuses' muscles
The popular exercise series P90X, which promises to take you from “regular to ripped in 90 days" relies on the trademarked term "muscle confusion," meaning your body is constantly introduced to new moves and routines, Leslie Barker …
Julie's Health Club – http://featuresblogs.chicagotribune.com/features_julieshealthclub/