A:Shaft flexibility is just as crucial as balance when purchasing a badminton racquet, and the correct level for you is dependent on your wrist/arm speed. Manufacturers have generally agreed upon on categorising rackets as 'Flexible', 'Medium' and 'Stiff', though there are variations on this such as 'Medium-Stiff' and 'Extra Stiff'. Put simply, the quicker and more explosive your wrist/arm speed (often known as swing speed), the more likely you are to benefit from a stiffer shaft. The slower and smoother your wrist/arm speed, the more likely you are to benefit from a more flexible shaft. Beginners are far more likely to benefit from purchasing a racket with a flexible shaft, whereas more advanced players tend to favour stiffer shafts as advanced players have much better technique. If you are unsure about how much flex you need, then you should purchase a medium or medium-stiff flex badminton racket.Stiff
A stiffer shaft will bend and then unbend very quickly, ensuring the explosive swing-speed player has the maximum power and control possible. By comparison, a slower swing-speed player would not be able to use the advantage of a stiff shaft as the shaft would not bend or unbend enough, resulting in a loss of power.
A more flexible shaft will bend and unbend much more easily, ensuring that players will get the racket to bend and unbend to the required level. By comparison, a more explosive, fast swing-speed player using a more flexible frame would connect with the shuttle prematurely, before the shaft unbends and is still bent backwards, resulting in a loss of control and power.