David Kirsch says you should mix up workouts so your muscles stay surprised and you avoid burning out. He points out that a cheap jump rope can be used anywhere, keeping training portable and fun. He also believes cooking your own meals and choosing lean protein with fiber‑rich veggies helps the body stay smarter than the plan.
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David Guy Kirsch is an American oncologist currently the Barbara Levine University Professor at Duke University and an Elected Fellow of the American Association for the Advancement of Science.