First of all, you can practice sitting posture and lift your knees first.
Second, sit on the edge of a bed or chair.
Third, lean back and forth, keep your feet off the ground, and make your body lean as much as possible.
Put your hands on both sides of your hips. It is best to grasp the edge of the sitting object, then lift your knees (try to use abdominal muscles consciously) and exhale at the same time. Breathe gently and exhale when you feel the abdominal muscles fully contract (find the feeling of stomachache when you laugh).
Then gently lower your knees and inhale at the same time. Each action may take 8 seconds, and you can take several breaths between each action. The difficulty of this action is that the abdominal muscles are always in a state of tension.
Don't walk too fast (that is, finish the action with inertia), or you won't practice! After abdominal strength is enough, try to do sit-ups step by step, so as to practice sit-ups.
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Sit-ups are an important part of physical exercise, but some people misunderstand them as helping to reduce abdominal fat. In fact, fat is the last substance consumed in exercise, so long-term aerobic exercise is necessary to reduce fat.
Body fat consumption is not selective, but is consumed from all parts at the same time. Therefore, exercise-related parts and adjacent areas should not burn off the fat in this area, but should adhere to aerobic exercise all over the body, and moderate running or swimming is appropriate.