[Fitness ball sit-ups] mainly exercises abdominal muscles.
The action is basically the same as ordinary sit-ups. You can cross your hands on your chest or gently hold your ears.
Using a fitness ball to do sit-ups can make the upper body rise more, thereby reducing the difficulty of the movement.
It is more suitable for fitness "freshmen" or girls, so it is the best choice for girlfriends to work out together.
Ideal number of groups: 30/group, do 3~5 groups.
