Step 1: Prepare a notebook with the thickness of a notebook;

Step 2: Sit in a chair and sit up straight;

Step 3: put the notebook on the inner thigh and clamp it hard for five minutes. You must persist for ten minutes to relax.

Note: The purpose of the notebook is to tell you that if the notebook is dropped, it means that you have not clamped it hard, and you must not let the notebook fall during the whole process. If you really try hard, you will feel sore in your thighs after two days, which means it is effective. It's about persistence If you succeed, accept my answer.