Had my TA medical last week and this week I'm going to be attested and start PT etc. But a couple of days ago I strained my quad muscle while out running. Can manage to walk but can't really do anything more strenuous than that. Do i need to get a doctors certificate to exempt me from my first drill night? Obviously I will go along and want to do as much as possible but equally I dont want to do myself any further damage. Any advice gratefully received.