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What does a 10-year-old have in common with a pro boxer? Both jump rope with ease, says Grant Opperman. “Boxers, some of the fittest athletes in the world, work cardio, reflexes and coordination by performing an activity most of us did as children,” he says. “And even though it’s grueling, there’s also something really fun about jumping rope.”
Mr. Opperman, the 52-year-old founder of the Microburst Group, a Bay Area communications and strategy consultancy, began his search for a sustainable workout in 1996. “I was 31…