Michael Esco, PhD, CSCS of WebMD posted a review on Insanity. Here are some snippets.

The Insanity workouts are highly intense and designed for people who are already in good shape. It is not intended for special-need populations, such as cardiovascular, pulmonary, and metabolic disease patients, diabetics, or obese people, and people with orthopedic limitations. If you are extremely unfit and looking for an “easy fix”, then Insanity is not for you. The program will work best for people who already exercise on a regular basis and are willing to work hard.

Do you sometimes gain weight when starting a new exercise program?

I found this excellent post by Chalene Johnson, the creator of Turbo Jam, Turbo Fire, and ChaLEAN Extreme.

This is a repost from the P90x #053 newsletter and has some great information on how P90x works and why it works.

By Steve Edwards

With the popularity of P90X, the term Muscle Confusion™ is getting a lot of play in the media. And while many people credit it as the reason P90X is effective, not many people understand what it means, much less how it works. Today, we'll briefly examine what Muscle Confusion is and why it's so effective.

P90x has three different workout schedules: The P90x Classic, P90x Doubles, and P90x Lean. If you are new to P90x, it comes on 12 DVDs, which is explained in my Power 90X Extreme Training System post. It consists of high-intensity muscular workouts led by fitness instructor Tony Horton.

If you are looking to lose weight and staying lean, take a look below. If you want to build muscle with P90x take a look at the P90x Classic Workout Schedule.

P90x has three different workout schedules: The P90x Classic, P90x Doubles, and P90x Lean. If you are new to P90x, it comes on 12 DVDs, which is explained in my Power 90X Extreme Training System post. It consists of high-intensity muscular workouts led by fitness instructor Tony Horton.

The classic version of the P90x Workout Schedule is designed for burning fat and building muscle. Please note that this schedule will build muscle! If you are looking to lose weight and staying lean, take a look at the P90x Lean Schedule.