What is flex?
Flex refers to the amount a shaft will bend during the swing. When the flex has been properly fitted, the shaft will bend back (lag) during the downswing and recover to a straight or slightly forward position at impact, delivering the clubhead in a square position with maximum clubhead speed. A shaft that is too flexible will not be strong enough to unload properly, resulting in high trajectories and control problems. A shaft that is too stiff will not be loaded fully on the downswing, resulting in losses in distance and poor control, and a tendency to hit the ball low and to the right.
