Easy Knee-Tuck Crunches

Easy Knee-Tuck Crunches

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Capitalize on the instability of an exercise ball, and try the tuck crunch. This move strengthens your core while toning your arms, chest, shoulders, and lower abs.

• Get into a plank with your shins on the ball.
• Pull your knees toward your chest, and then shoot your legs back out. Keep your body in a plank position the entire time.
• Do three sets of 15 to 20 crunches.

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