Cycling is an aerobic exercise, which, like jogging and swimming, is mainly to lose weight. If the purpose is to train abdominal muscles, then it is impossible to train a large number of developed abdominal muscles just by riding a bicycle, because riding a bicycle without training abdominal muscles can only reduce abdominal fat. It is good for women who practice vest line (Sichuan abdominal muscles). \x0d\ If you want to exercise your abdominal muscles, you can usually do more supine leg lifts. Do 4 groups, each group is about 10, and each group has a rest 1 minute.