Ask a pro fitter about who comes into their lab.
A good percentage come in because of pain. Road bike riding puts a rider in a position that's not all comfortable. Then, there's that repetitive motion. And there's those nagging injuries from other sports in the past that now seem to rear it's ugly head.
A pro fitter sometimes becomes a type of a coach. They sometimes tell you what a rider is doing wrong and right, depending on the type of riding. They even suggest different kinds of exercises to build up strength.