The HA's that i knew (Salem Massachusetts area) were all really into weightlifting (getting bigger/stronger)
they even had a fully equipped gym at their "clubhouse" (i checked it out one night after the niteclub i worked at had hosted a "Bikers Ball" with the HA's ......the president of the chapter at the time was a pretty big dude and we hit it off pretty well and he showed me the gym)
not so much into bodybuilding per se (the whole "posing trunks on a stage thing" lol!)
but def into getting big and jacked!