[Abdominal Muscle Exercise]
Launch the ball in a prone position until the resistance ball is under the knees and calves. Place your U-shaped palms horizontally and shoulder-width apart, and keep your elbows straight but not dead. Lock, torso and abdominal adduction to make a straight line from shoulders to toes.
Use your abdominal strength to push your body upward to drive the resistance ball. Let your lower body, knees and ankles move on the ball in the opposite direction. Finally, kneel on the ball and slowly lower your body. 4 sets of 20 reps every other day.
