Tony Horton has based his P90X workout on the premise of 'Muscle Confusion', in which the 3 month workout is broken down into different phases, each containing a different variety of moves. The idea is that constantly changing the nature of your workout will help you avoid the 'Plateau Effect', where your body grows accustomed to the nature of the workout being asked of it, and stops growing as quickly. Is this true? Is there science behind this claim? In today's blog post, we take a closer look.