Retracting arms is suitable for practicing push-ups. Simple is oblique push-ups, which is very simple and convenient to exercise. You can also practice for 20 minutes at a time, or you can divide into three groups with 20 in each group. Take a break for one minute between groups and knead your arms after practice to avoid long muscles. However, it is very slow to exercise only by thin arms. It is recommended to match beauty. Thin arms are definitely the best. The key is to lose weight for more than two years and have not regained it. Besides exercise, you should also control your diet.