Lower Your entire body till your rear knee just about touches the ground and also your front thigh is parallel to the ground. Then thrust with the heel of one's front foot to return to standing, maintaining the back foot on the bench. Repeat for needed reps then swap legs. https://econopass.com/health-and-fitness/fitness-zone/fitness-effective-workouts/10-effective-exercises-building-lifelong-core-strength-without-planks/