What is roll-up (with ball)?

Roll-up (with ball)

1. Lie on your back on the floor, with your knees bent and your feet flat on the floor. (Or you can lie on any flat surface, such as a bed.)
2. Lay the ball on your thighs. Rest your hands up high on the ball.
3. Slowly tighten your belly muscles. Keep breathing and don't hold your breath. Raising your head and shoulder blades, roll the ball up your thighs. Exhale as you roll up.
4. Keep your neck straight and don't press your chin to your chest. If this exercise is hard on your neck, gently support your lower head and upper neck with one hand. Don't use that hand to pull your head up.
5. Hold for 1 to 2 seconds. Then slowly lower yourself back to the floor.
6. Repeat 8 to 12 times.