1.First lie down on the floor and bent your knees with your feet secured on the floor. And place your hands behind your head or in front of your body in a straight form; this is your starting position.
2.Flex your hips and spine to raise your upper body until its perpendicular to the ground.
3.Reverse the motion and repeat.
Tips and Advices:
Lower your body backward until almost parallel to the floor, about three-quarters of the way down because if you lean back too far, tension is released from the abdominal muscles and more stress Is placed on the lower back.