you are recovering from attack of jaundice.Doctor has advice you not to undertake rigorous physical activity .write letter to principal of your school requesting him/her to excuse your from games and P.T classes for two weeks.
11 August 20xx
Subject: Excuse from physical training classes
I am PQR, a student of class VI A of your school. This is to request you to exempt me from attending physical training classes and sports activities for two weeks as I am recovering from an attack of jaundice. The doctor has advised me not to undertake strenuous physical activity. I promise to utilise the time of these classes to complete the school work that I have missed due to my illness.
Thanking you in anticipation.