http://www.HeyChubby.com/p90x Tony Horton explains the P90x legs and back workout. Get ready to squat, lunge, and pull for a total-body workout like no other. While the main focus of this workout lies in strengthening and developing the leg muscles (quads, hamstrings, glutes, and calves), there's also a handful of great pull-up exercises to give your legs a quick breather while you work the upper body.
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