name me one successful bodybuider or powerlifter that runs long distance. i dont think there are any, but if there are, it'd be interesting to know who they are.
personally, running breaks me down. i lose a lot of weight, i'm sure a lot of it is LBM. i also lose tons of strength and it's hard on my knees. i could do it if i had to, i suppose.
but i wouldnt reccomend it to anyone if it goes against any strength/size goals they may have