Created by fitness expert Tony Horton, P90X is a workout program designed to build strong, lean bodies. The 90-day 12-DVD program includes cardiovascular workouts, strength training, core and abdominal work, and flexibility. The program comes with three schedules depending on your fitness goals: the Classic with a focus on muscle building; the Lean, which has more cardio; and the Doubles, for advanced exercisers who want to do two workouts a day. The P90X includes three DVDs specifically designed to burn calories; however, the strength training workouts build muscle, which increases calorie burn.
The Cardio X DVD is designed to burn calories and fat. Drawing from kenpo, core, plyometrics and yoga, Cardio X offers variety while building on skills learned from other DVDs. Highly fit people may find the Cardio X program doesn't have the intensity of other cardio options such as running, however, the program offers other benefits such as improving balance; flexibility; and leg, glute and core strength.
Horton says that plyometrics will help you jump higher and run faster. It uses jump training to burn calories and build lower-body strength. The program adds jumps and leaps to squats and lunges, and also includes lateral and forward and back movements. Most exercises are done in 30-second increments that increase the heart rate to the top of the heart rate zone, making plyometrics an effective interval workout.
Kenpo is a martial art similar to kickboxing. It uses a variety of punches and kicks to increase the heart rate, improve balance and strengthen core muscles. Horton reports that while the workout is strenuous, it's constantly moving and fun, making the time pass quickly. Extremely fit exercisers may not find the program as vigorous as other cardiovascular options such as running, but the benefits to balance and flexibility make kenpo a worthwhile workout.
P90X comes with seven DVDs designed to build strength. With the exception of Core Synergistics, these DVDs don't increase the heart rate significantly, but they build muscle, which is important in calorie burn. Increased muscle speeds up the metabolism, resulting in more calories burned throughout the day, even while doing regular activities.