This topic has come up several times in other threads, but I'm curious about why it happens. Pro bodybuilders of today seem to have much larger legs (in proportion to upper body) than, say in the 50s/60s. Is this because classic BBers concentrated more on working the upper body? Or because anabolic aids help the lower body than upper?
I've stated my preference before, so I'm going to leave it out of this discussion. I'm just curious if training or something else tends to produce this effect. I train my whole body as hard as I can on all exercises, and I would think that bodybuilders from any era would have done the same.