Joel Harper demos the up, dog, up exercise.

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Up, Dog, Up
(Stretches abdominals and obliques)

From a push-up position, with your hands below your shoulders, lift your chest and torso up into the air so your upper body is nearly perpendicular to the floor as you come onto the tops of your feet. Arch backward to stretch your abdominals, but keep your butt relaxed. Hold 10 seconds. Then look over your right shoulder for 10, your left shoulder for 10, and back to center.