Crank Plank: Get into a side plank, weight on your left forearm and foot, right hand behind your head.
Rotate your torso, bringing your right elbow forward and down. Return to start. Do 10 to 15, then switch sides.
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Spiderman Push-Up: Assume a plank position.
Lower your body toward the floor and bend your right leg out and up toward your elbow. Pause, then return to start. Switch legs. Do 10 to 15, alternating sides.