I strongly disagree about the top golfers "overdoing" it with fitness, gaining muscle etc. I think it's easy to get a skewed view of tiger in terms of his muscle development over the years. As a certified fitness trainer, I've seen a ton of people make similar gains over years of hard work and dedication. What's more, Tiger is 6-1 and listed between 180-200lbs...that's really nothing to dramatic is it? Sure he's in great shape and looks big...he has great genetics and works his butt off. But I personally think its an absurd claim to even bring any sort of illegal supplements into the discussion or pointing towards his development being a disadvantage. These guys are all professionally trained now a days, they don't ignore flexibility. I guarantee you if he's lost flexibility it's due to age and injury histories versus putting on "too much mass".
Furthermore, discounting the strength of guys like Jack, Daly and Arnie is silly. They were and are big, powerful guys. Sure they had fat, which probably makes it easy to assume they are weak...but I really don't think that was the case at all. Jack is what, 5-11? In his prime he looked to be at least pushing the 200 mark, I bet you he was extremely strong back then as well.