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iVillage: The Busy Woman’s Guide to a Better Body

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The ultimate multitasker, you think using hand weights on the treadmill is the definition of an efficient workout.

“I strongly discourage doing cardio and strength training at the same time,” says Nettle. When you’re moving your legs, your main focus is on balance. “What happens is that the lifting becomes mindless, which puts you at risk of injury,” she says. The most effective way to strength train is by doing slow, focused repetitions on solid ground. Stashing a set of hand weights near your desk isn’t a bad idea, “but just don’t try to read e-mail and do biceps curls at the same time,” Nettle says.

(CREDIT: George Doyle Collection, Stockbyte, Getty Images)
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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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