This is a great article published by ACE with some important facts about these three programs.
P90X™, Insanity™ and Rushfit™—turn on your TV or computer, and you’ll be hard pressed to miss an infomercial from one of these products claiming that it will transform your body into the “best shape of your life.” Given their extreme popularity (and subsequent profitability), it’s no surprise that these programs have spawned sequels and imitators. Interestingly, each product includes some slick marketing educational piece demonstrating the program’s revolutionary training method for shaping your physique, whether it be through “Muscle Confusion,” “Max Interval Training” or “High Intensity Interval Training.” Hardly revolutionary, these are training modalities that are generally categorized under Metabolic Conditioning (MC). After all, years before these programs existed, renowned researcher Dr. William Kraemer, a professor of kinesiology at the University of Connecticut, Storrs, demonstrated the merits of muscle confusion (non-linear or undulating periodization), including the ability to induce greater levels of metabolic stress and adaptation upon the body. And Tabata, LaForgia and colleagues demonstrated the benefits of high-intensity interval training (H.I.I.T.) approximately 15 years ago. BeachbodyTM (which produces both Insanity and P90X) and others have successfully turned these concepts into revenue-generating goldmines. Of course, popularity is no guarantee of effectiveness, so ACE decided to put P90X, Insanity and Rushfit to the test in a head-to-head match-up to evaluate each on the basis on efficacy, science and safety.
Click HERE to read on.