I work in the resource industry and medicals are standard practise. We use it to mainly make sure any pre-existing/ medical issues are appropriately managed. We have different levels of medicals depending on the physical demands of the role but as an example for our "desk job" medical you have to do a health history check, drug and alcohol screen, vision test, blood pressure/ cardiovascular check, hearing check, lung function check and musculoskeletal system checks. Usually the company book and pay for the medical so you would go to a Doctor of their choosing- we use a specialised occupational health clinic to complete all our medicals and you must go there.