Doing "belly rolling" (also called "positive compression") on the fitness ball has the best effect on exercising abdominal muscles, which has been verified by international bodybuilding authorities.

The effect of traditional sit-ups on abdominal muscle training is not ideal, and it damages the lumbar spine, leading to pelvic forward tilt and low back pain.

Doing "belly rolling" on the fitness ball has the greatest stimulation intensity on the abdominal muscles and no pressure on the lumbar spine. It can not only shape abdominal muscles well, but also prevent low back pain. It is an abdominal exercise strongly recommended by international fitness coaches.