Most amateur golfer don't swing as fast as, say, Rory Mcilroy (about 120-125 mph). The shafts he uses are very stiff. At least once a week one of my students asks if he or she (mostly the "he's") if they should be using stiffer shafts to get more distance off the tee, like Rory (average is 310+).
99.9% of the time (or more) the answer is "no".
Check out the video and find out why. The answer may surprise you.
Enjoy the game again,
P.S. Nice surprise for PRO members just around the corner. Stay tuned.