Through diet an exercise, yes.
Some are genetics some are through workouts it depends on what your standards for great body is.
if you really want to sure you can
anyone can get a really great physique genetics help folks achieve it faster and of course all champions are genetically gifted
Its a combination of genetics and the work you put in. For some it's going to take more effort than others, but yes, pretty much everyone has the potential to have a nice body.