"Exercises for thin belly"
Targeted exercise 1: non-general sit-ups. That is, hold your hands over your head, use the power of your abdomen to lift your upper body to 30~60° from the ground, then HOLD it for 5s, then lie down again, and so on and so forth. This action is repeated for 3 groups, 15 times per group.
Targeting action 2: upward sloping angle sit-ups. That is, hands on the head, feet up and the ground is 60 °, lift the upper body, with the right elbow touching the left knee, and then the left elbow touching the right knee. Repeat this action for 2 groups, 25-30 times per group.
"Tightening Abdominal Exercises"
Target Movement 1: Front Side Bend. Open your feet slightly wider than shoulder width and spread your hands horizontally. Bend forward with your left hand touching the top of your right foot, return to standing straight, and bend forward with your right hand touching the top of your left foot. Repeat this movement for 3 sets of 10 repetitions each.
Targeted action 2: positive side bending. Feet open, slightly wider than shoulder width, fitness bar placed on the shoulders, both hands hold (if there is no fitness bar, the arms overlap the flat end with the chest), to keep the back straight. Then slowly stretch the waist to both sides, the amplitude depends on the individual situation, do not excessive side bending, to avoid strains. This action is repeated for 3 groups, 20 times per group.