How Does It Work?
The "classic" version of the program requires 13 weeks of 6-day workouts with an optional stretch on the seventh day. On most of the weeks, Days 1, 3, and 5 of the workout are strength-training for various parts of the body like biceps, triceps, shoulders, back, and legs. On these days, a 15-minute Abs session is included after the regular workouts. Days 2, 4, and 6 are for the cardio-related exercises: plyometrics, yoga, and kenpo, respectively.

The program begins with three weeks of the same six days of exercises repeated every week. Weeks 5 through 7 are similar to weeks 1 through 3 except that some of the strength training routines are different. Weeks 9-12 then alternate between the exercises from weeks 1-3 and 5-7. Weeks 4, 8, and 13 are designated "rest" weeks which don't include strength training but instead consist entirely of the cardio-related exercises with core synergistics and stretching added in as well.

The workout can also be modified into the "lean" or "doubles" versions.

How Does It Keep You Motivated?
The secret behind the P90X system is an advanced training technique called "Muscle Confusion," which accelerates the results process by constantly introducing new moves and routines so your body never plateaus, and you never get bored! Whether you want to get lean, bulk up, or just plain get ripped, there's an endless variety of ways to mix and match the routines to keep you motivated the full 90 days and beyond!

P90X - Extreme Home Fitness - DVD 9: Chest, Shoulders & Triceps
Packed with an array of moves that target both large and small muscles, this workout will do wonders for your upper body. In just one full sequence you'll get a healthy dose of presses, flys, and extensions to push you to the brink. The results will be a stronger, leaner, and highly defined upper torso that will leave you looking awesome, with or without a shirt.