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Tone Up All Over

"I do a 10-minute ab workout that [boxer] Manny Pacquiao invented—you can find it on YouTube. It’s about 20 different versions of crunches, and you do 25 seconds of each nonstop. It’s brutal, but it really works!"
Shawn Johnson, 20, gymnast; four-time Olympic medalist

"With sabre fencing, it’s important to have a strong core. I do an exercise called ‘the dead bug.’ You sit on the round side of a Bosu ball, lean back, extend one arm and the opposite leg, then switch."
Mariel Zagunis, 27, fencer; three-time Olympic medalist

"Deep squats work so many muscles in your body. Once a week, I do three sets of six, or eight of the free-bar ones, which can help out your balance and work more muscles than doing them on the machine."
Lolo Jones

(Getty Images)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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