I have had so many of these "Physicals" in my life. I have got to the point where I refuse to take them. I think I know when something is wrong with me.
What they entail.
Height/Weight
Blood Pressure
Eyes/Ears/Mouth (They check these areas)
Reflexes (Hit your joints with the little hammer)
Hernia Check (Drop and Cough)
Final Inspection (Just randomly look you over)
Thats the normal run through that they do.
Most of the time they want a urine sample, but you can allways decline to do this part. If your job requires you to take one, which being a police officer will, then you have to. If you are nervous to be naked in front of a stranger, don't worry. EVERYONE hates having a physical done.
Hope this helps.