STARTING POSITION:
Lie on the floor face down and place your hands slightly wider than shoulder width apart while holding your torso up at arms length. You need to find a fitball and place it behind you. Support your weight on your hands and place your feet on the fitball. Your hands should be just below your shoulders. Contract your pelvic floor and core while keep your body straight. With your legs straight, raise your hips as much as you can.
MOVEMENT:
Maintaining the balance, raise your right leg as much as you can. Return to the starting position and repeat the movement with your left leg.
TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form.