Lie on your back and put a backpack (or some other thing that’s heavy) on your legs
Note: The weight is optional; the exercise is difficult even with your own bodyweight.
2. Lift your pelvis off the ground by pushing your heels down to the ground (This is the starting position).
3. Bend your knees while keeping your pelvis off the ground and slowly extend your knees back to the starting position.
Doable at:
Muscle group/groups:
Working muscle/muscles:
