Push with the heel of one's entrance foot, activating your glutes and thigh muscles to carry your body back towards the commencing stance. Brace your abs and lower your bum back and down (just as if sitting down into a chair) trying to keep the weight with your heels and https://econopass.com/health-and-fitness/fitness-zone/fitness-effective-workouts/10-effective-exercises-building-lifelong-core-strength-without-planks/