[Ball Sit-ups] mainly exercises the upper abdomen. Lie flat on the ball, sit on 1/3 of the ball with your buttocks, spread your feet shoulder-width apart, slightly bend your knees, put your hands behind your head, exhale, tighten your abdomen to lift your upper body, inhale, Fall back slowly. Do 8 to 12 times in a row for a total of 3 sets, resting for 60 seconds between each set. Tip: If you have problems with your spine or lumbar vertebrae, don’t raise the angle too high to avoid strain.
