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Get into a plank position with your hands placed directly beneath your shoulders and your abs tight (so your body forms a straight line from your head to your toes). Squeeze your butt to raise your right leg until you feel your butt muscles working.
Leg Extension - Part 2
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Return your right foot to the floor. Do 10 leg raises on that side (holding a straight plank position the entire time), then repeat with your left leg.