Begin in modified plank position with your weight on your forearms. Your body should form a straight line from your shoulders to your ankles. Brace your core by contracting your abs as if you were about to be punched in the gut.
Bend your left leg, curling your heel into your body, flexing your foot. Squeeze your inner thighs and press your knees together. Press your left heel up to the ceiling, lifting your left knee about six inches above your right. Bring your knees back together (keeping your left knee bent) and squeeze your inner thighs. Do 15 reps with your left leg, and then 15 with the right.
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