Second, the intensity is not enough. Compared with other muscle groups, abdominal muscles are more difficult to practice. Give enough stimulation every day, for example, twice a day, divided into three groups each time, and each group should be exhausted (not less than 20 times). At the same time, pay attention to the rhythm (fast rising and slow falling). In short, there should be obvious pain the next day.

In the final analysis, the most important thing about fitness is: persistence, persistence is the most important thing.

good luck