How does P90X work? Part 1 of 12

If you've seen the P90X® infomercial, gotten excited, and then asked yourself How does P90X work?, then this 12-part series is for you. Part 1 covers the P90X Chest and Back workout. P90X Chest & BackThe P90X chest and back workout wastes no time in showing you how intense P90X can be. It tackles the basic "pushing and pulling" activities that many regular exercisers will be familiar with. Rather than splitting those activities into separate workouts, however, the P90X chest and back work