When you do the P90X Legs and Back routine, you use the largest muscle groups in the body, which is great. However, when you step up your game with heavier weights and/or repetitions, those big muscles use a lot of your available energy. This video is about how to interpret your workout results based on your performance.
If you’re willing to take on the P90X challenge (and get the best results of your life!), then grab your copy of P90X so Shanna and Aaron can Coach you to success!
