Tip 3: Throw "curveballs" at your body Peterson says that with his A-list clients like Jennifer Lopez, he never repeats the same workouts. He switches up their routines and says you should too. "Never marry yourself to something," he says. "Try [a workout] for a month, then try something else the next month," he says. You have to throw your body "curveballs," explains Peterson, to keep your muscles guessing and working at their optimum level. That's why he has his stars do all pulling exercises one day, then all pushing the next, for example.
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