If you don't apply for running for physical reasons, you should write it yourself according to your actual situation. The following is for reference only. Please write according to your actual situation.

Dear XXX:

My name is XXX, and I am now a student majoring in XXXX at XXXX University. My student number is XXXX. For physical reasons, the doctor advised me not to take part in running exercise. I hereby ask for leave.

Leave time: XXXX XX to XXXX XX, ***XX days.

I promise to return to China as soon as possible according to the number of trains, and I will not stop at will on the way. During my suspension from school, I will strictly abide by the school's management regulations, pay attention to personal safety and not participate in illegal or high-risk activities. Otherwise, all problems will occur at your own risk.

Personal phone number: XXX-XXXX-XXXX

Home phone: XXX-XXXX-XXXX

Applicant: XXX

Date: XXXX, xx, xx, xx, xx.