I did my medical MANY years ago but the basics are the same: lung capacity test (vitelograph or something like that lol), hearing test, chest x-ray (not sure they still do that), blood pressure, hear rate, up and down on couple of steps for few minutes, the "cough" test!!, but not much more. Most people I know that failed did so on the lung or hearing test and most of them had a dodgy problem in the first place so I wouldn't get too concerned. Blood tests too when I did it. Perhaps someone else can update you a bit better but hope this helps.