Hmm i didn`t find out a lot of things, but Robert Pattinson`s workout started intensly for the roles in bla bla Twilight and bla bla New Moon cause he needed the extra muscles.

Here is a basic Robert Pattinson Workout:

Robert Pattinson for two months

Robert Pattinson did all this to get in shape (show some muscle) to play that vampire role.

After i saw Robert Pattinson`s workout i got to the conclusion that he starved to death, did a lot of exercise and just destroyed his metabolism, well still Robert Pattinson`s face in those movies made him look ill (like suffering from something, a disease).
And yes, that photo of Robert Pattinson with those simetrical dots on the muscles is to photoshop more easily and make them appear bigger than they really are or other visual effects.