[Sauron the White]

from Galendor

As far as stunts go, I doubt Orlando Bloom can actually swing around a brontosaurus-sized oiliphant and slide down its trunk, but he appeared to do so in the movie. There are obviously movie-magic methods of making it appear as if the human actor performs inhuman feats

You do realize that in order to do this Bloom spent the better part of a day or two hanging from ropes on walls and doing some very strenuous and athletic things so the filmmakers could get what they wanted? I do not imagine that a emaciated 85 pound actor could perform the various strenuous and athletic antics necessary to capture the movements of Gollum.