Golf Channel did a nice segment during final round Bob Hope coverage where they asked Kenny Perry about changes he's seen during his long and successful career. Here's the text and the video for those who would like to insist the guys are just working out more!
I have seen a lot of changes. I led the tour I guess in '91 in driving distance, I averaged 291. And now Bubba's hitting it 350-360-whatever. It's funny, the clubhead speed I had, I had probably 4-5 mph hour less now clubhead speed I know for sure than I did in 91. and actually I'm averaging 300, 299, so I'm hitting it further with less clubhead speed. So it tells me between golf ball technology, clubhead, driver, shafts, total package, we've got higher launch less spin on the golf ball, so the golf all just goes a long way now.