Some will argue that muscle confusion is no good for building muscle mass. But I have to admit, the P90X workouts are no joke! I would like to consider myself somewhat in shape, but when I did the videos I was extremely sore. After doing the biceps video, I 
couldn’t straighten my arms all the way for two days. I liked the videos so much, I’m going to put a copy in my corporate fitness center for employees to use on their lunch breaks.
Mix It Up in Corporate Fitness Programs
I feel that mixing up your workouts and adding variety will help increase strength, endurance, speed, and agility. You increase in all of those areas by keeping your muscles guessing and challenged. After years of always running and lifting the same weight and exercises, I finally discovered it is okay to not have a routine. This might seem difficult to those of you who hate change, but the results are worth it.
Now I change up all my workouts, especially in the classes I teach at the onsite corporate fitness facility. This helps the employees who won’t change their workouts on their own. As a result, our bodies can handle more basic daily movements (unloading the groceries, cleaning out the garage, and so on) and we are stronger for those not-so-graceful falls.
P90X Is Not for Beginners
In my opinion, P90X is not for beginners. Like I said, I work out on a regular basis and teach at a corporate facility, and for two days I couldn’t wash my hair because I couldn’t get my arms up that high. So, please take it slow and do only half the video at first if you are a true beginner or if it’s been years since you have worked out.