By this time, you have probably heard a lot about one of the biggest exercise crazes ever, the Power 90 Extreme or, as it is more commonly referred to, P90X. This is a home exercise system that comes from a solid history of other systems. Its effectiveness is due to a very specific trick that is known as “muscle confusion”. The workouts are easy to follow along with. You will be doing many workouts that target different parts of the body. There is also a nutrition plan to accompany it. You will need some equipment, too.