Step 1:Begin in high plank position with your hands directly under your shoulders. Your body should be in a straight, diagonal line from your head to your heels.
Step 2: With your core engaged, bring your right knee forward under your chest, with the toes just off the ground. Return to your basic plank. Switch legs, bringing the left knee forward. Keep alternating legs and pick up the pace until it feels a little like running in place in a plank position.
Modification (Beginner): Elevate your hands on a bench or a step.
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