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Lying Hamstring Curl

This move tones your butt and backs of the thighs. Harley recommends doing this move with one leg raised; to do so, plant one foot on the ball, and lift your other leg up, keeping it straight the whole time. Here's how to do it with both feet:

  • Start by lying flat on your back with an exercise ball under your heels. Bridge your hips up, and hold that position through the entire exercise.
  • Flex your feet, and dig your heels into the ball. Place your arms straight out to your side for support — don't use them, though; they are just for support.
  • Slowly roll the ball toward your body as you curl your heels. Keep your hips in the bridge position; don't thrust them toward the ceiling as you do the move.
  • Then slowly return to the start position (straight legs, hips bridged) to complete one repetition.
  • Do three sets of 12 to 15 reps.

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