most of it is genetics but working him out can help muscle tone and can braoden the chest with muscle mass, good things to do is swimming if he will go in water, flirt pole and spring pole and even running can help. You can only do so much with excercise genetics will play the biggest role. Have you seen the dogs in his ped? grandparents and parents? do they have broad chests? Also at 2 and his balls are just now dropping???? I would have that looked at as 2 is very late for balls to be dropping, make sure they fully drop.. personally I would have had that checked out like a year ago.
Pit bulls are..... Beauty without Vanity, Strength without Insolence, Courage without Ferocity, and all the Virtues of Man, without his Vices.""