The P90X system is a 90-day workout routine that uses a technique called “muscle confusion,” a technique that prevents exercise plateauing by varying exercises over days and weeks such that the body has difficulty adapting. The system includes strength training, cardio, and stretching. Notably, in addition to pull-up and push-up emphasizing workouts, the system also stresses overall body fitness by including plyometrics (jump training), yoga, and kenpo.