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P90X begins each workout with a warm up and stretch. It is essential that you get the muscles loosed up before starting the exercise. This will increase blood flow to the muscles and increase your heart rate. This will also help prevent any potential injuries.
Did you miss our previous article...
https://exercisevideos.club/px90-workouts/do-this-warm-up-before-your-workouts-quick-warm-up-routine