Apparently so were the players.
We were hearing "juiced" ball and "corked" bat stories back in the mid eighties, and for good reason IMO.
"Apparently so were the players. "
Of course, you're quite right. I searched for the most "muscled up" photo I could find of Roger Maris. Here it is.
Perhaps players conditioned more for flexibility instead of maximum strength back then? Maybe.
But then I look at pics of Barry Bonds taken a few years apart.
Not only is his body obviously bulkier, even his face looks like it belongs to someone else.