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Make it harder: Hold a 3- to 6-pound medicine ball at chest (as shown).

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Switch sides, twisting torso to bent left knee for one rep. Continue alternating in a pedaling motion.

Do 15 reps. Switch sides; repeat.

Keeping left foot on ball, bring right knee toward chest, then kick right leg out to side.

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Return to start; repeat on opposite side for 1 rep. Continue for 45 seconds.

Hop feet back up to hands and jump, raising arms overhead.

Repeat on opposite side.

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Continue for 1 minute.

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