These instruments can only exercise local muscles and consume a certain amount of calories, but they have little or no effect on reducing abdominal fat. If you want to lose excess abdominal fat, you need to control dietary calories reasonably and do aerobic exercise such as jogging, swimming, cycling and aerobic exercise. Aerobic exercise can convert body fat into energy, which takes no less than 30 minutes at a time.

Sit-ups, a form of exercise. Lie on your back, put your legs together, raise your hand, contract your abdominal muscles, swing your arms forward, and quickly become a sitting position. Keep your upper body bent forward, touch your feet with your hands and bow your head. Then return to the sitting position. So continuous, practice sit-ups, the speed varies from person to person. You can try to do it five times a minute at first, and then slowly increase it until it reaches about 50 times.

Many women under the age of 30 practice for the purpose of preventing gynecological diseases. At this time, the frequency should be controlled at 60 ~ 70 beats per minute, which decreases with age. It is enough for people over 50 to do 25 per minute. For people who have a certain fitness foundation, they want to strengthen their abdominal strength through practice and ensure that they do it about 60 times a minute.

Reference: Baidu Encyclopedia "Sit-ups"