If courses and activities require a medical certificate, it is possible to set up different types of medical certificate by clicking on Settings -> Medical Certificate Types -> Add

These are the required fields:

Important: the button Delete will delete the medical certificate but it can only be used if the medical certificate hasn't been assigned to a user profile. Conversely, the medical certificate can be stored (Edit -> Info -> Stored). This means that the certificate will no longer be in use but it will be kept in the system for record purposes.