The thickness of legs is closely related to the running style. In the ideal middle and long distance running, the calf hardly exerts force, and the thigh is the main power output. The calf is mainly responsible for coordinating the position balance of the legs, swinging the feet naturally and assisting in force transmission.

I suggest you:

1. Increase the step distance, and use the inertia of thighs and body to take a few steps appropriately;

2. Breathing is very important. Breathe naturally through abdominal contraction and maintain a uniform frequency;

3. Change your running posture to make the whole movement stretch more naturally.

Don't deliberately control or adjust your diet, because with the approach of the senior high school entrance examination, all necessary nutrients should be kept up, and you can't give up your normal eating habits for a moment's feeling.