P90X2 WORKOUT: THIS IS NO ORDINARY SEQUEL. The result of 2 years of R&D conducted by a team of some of the most qualified experts in fitness, this is training so cutting edge, so outrageously effective, you'll be blown away by your visible results. AND your performance. P90X® is based on Muscle Confusion™—to break through normal 30-day training plateaus so you get results fast. P90X2 ups the ante with a training technique developed by professional sports trainers for world class results: P.A.P., or Post-Activation Potentiation. Don't try to remember the word, just remember that it works. Like crazy.