Match shaft torque to your swing speed
The instructor explains that more flexible shafts, like a lady's shaft, have more twisting - which he calls higher torsional stiffness - and that extra twist helps a much slower swinger square the club face up at impact. A stiffer tour shaft, such as a tour X, is normally heavier and more stable in the tip with less twisting in the head, which he links to the tighter dispersion better players talk about.
Channel: Mark Immelman
Watch official source at 12:07