1. Place the inside part of the top foot on a bench or box.

2. Lift the hips off the ground and maintain a solid side plank.

3. Try to minimize any movement for the duration of the set.

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Pro tip: If you have a history of knee injury, perform the exercise where the top leg is bent and the knee is on the bench. While this reduces the exercise intensity, it relieves your knee from a lot of stress.