The P90X DVD workout system is one of the hottest selling home exercise systems currently on the market. But at approximately $120 plus equipment costs, it isn't cheap. Many people who have seen the late night infomercials or read about the P90X workout system online wonder if it is really worth the investment.

Most people who are embarking on a new workout regimen are not doing so for the first time. We have all tried and failed with various programs in the past. That is why something as promising as the P90X training system looks so tempting.

The P90X workout system is a combination of 12 diverse and intense workouts on DVDs, a nutritional plan, an online support forum and a detailed fitness guide. Online reviews and P90X users who have blogged about their progress all showcase striking results using this 90-day workout program.

A very important thing that P90X users overwhelmingly report is that this program is extremely challenging. It is not the best workout for a person who is currently sedentary looking to begin a workout routine. This is for people who have already achieved a moderate level of fitness and are looking to take their bodies to the next level.

So what makes the P90X such a successful workout? Here are a few reasons why this workout program works as well as it does:

Variety

The P90X promotes something they call "muscle confusion." This is when the body's muscles are constantly challenged with new moves and routines. A person's fitness level never plateaus and they are never bored with the workout routine because it is different every day. By combining cardio, strength training, core training and even yoga, every aspect of fitness is covered. This is key because most people quit a workout program because they either get bored with the routine or they stop seeing results.

Nutrition Program

Anyone who has tried to transform their body knows that exercise alone cannot make big enough changes. The key to any successful workout program is pairing intense training with a healthy food plan. The P90X plan comes with comprehensive nutritional guidelines that steer users toward better eating habits. This is key not only for weight loss, but also for nourishing the body properly as it undertakes this intense workout schedule. The nutritional guidelines actually call for an increase in caloric intake to compensate for what is lost during the sessions and also to help build lean muscle mass.

Supplements

Because the P90X workout is so intense, it is often a struggle for users to maintain the proper caloric and protein intake to allow their body to heal in between sessions. That is why they also offer energy bars and drinks to supplement the nutritional program. Used immediately following an intense workout, these products fuel the muscles directly to achieve maximum results.

Customizable

The detailed fitness guide comes with various options for creating a training system to meet any goals. There are ways to customize the DVD's in order to highlight weight loss in the P90X Lean program and the Double program adds a second hour-long workout to some of the days for added results.