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Go Hard Core: 5 Ab Exercises for a Faster Run

Get a whittle faster. In a study, runners who did these moves four times weekly shaved a minute off their 5K times in six weeks. Try two sets of 12 reps each.
Russian Twist Russian Twist

Lie faceup on ball, knees bent, feet on floor. Extend arms toward ceiling and clasp hands. Keeping hips still, rotate upper body to right, then left, to complete 1 rep.

Originally published in FITNESS magazine, July/August 2009.