P90x is really a three months program. It's designed to be implemented in three phases, with the end of each phase/month involving a cool down week when your body is meant to recover from the 'muscle confusion' that the alteration of workouts is meant to deliver. INSANITY is easier. Designed to be accomplished in Sixty days, it's broken into two main phases, using the second being the 'MAX' phase where the workouts become even more intense and an intermediary week in-between in places you focus on Core Cardio and Balance for six days in a row, a period Shaun T calls 'Recovery Week'.
P90x is really a three months program. It's designed to be implemented in three phases, with the end of each phase/month involving a cool down week when your body is meant to recover from the 'muscle confusion' that the alteration of workouts is meant to deliver. INSANITY is easier. Designed to be accomplished in Sixty days, it's broken into two main phases, using the second being the 'MAX' phase where the workouts become even more intense and an intermediary week in-between in places you focus on Core Cardio and Balance for six days in a row, a period Shaun T calls 'Recovery Week'.