It is very effective to practice with the abdominal ripper on KEEP, provided that your body fat rate is low. If your body fat rate is high, it means that your abdominal muscles are developed. Because the fat is too thick, you will cover the abdominal muscles, so you can also do some aerobic exercise to reduce fat when exercising the abdominal muscles, such as running and skipping rope. There is also a need to strictly control the diet and not eat fried barbecue food.