Hi golfers, I'm PGA Professional Todd Kolb for About.com. We're going to talk about what the flex ratings mean in golf shafts.In golf clubs, the shaft is a very integral part in how the golf club is going to perform and many times we might even call the golf shaft the motor of the golf club, and the reason we say that is because not only does it come in different lengths but it also comes in what we call different flex ratings. Now, these flex ratings will dictate how the golf clubs react. Now, there are a couple different ways that we go about first of all determining what the best one is for you. It's going to be based on primarily two things, your particular swing style and then also the rate at which you swing the golf club. The faster you swing the golf club the stiffer the golf shaft is going to be.So let's go through the different categories to flex reading in the shafts. The first one and the most stiff one is what we call the X Flex. This is used primarily by good golfers who have a high swing speed. The next one is what we call the S Flex. That stands for stiff. Now, this is generally used by a lot of male golfers who are generally better players but who also have a swing speed that is pretty high and are swinging the club relatively aggressive. The next step down is what we call the R Flex. The R Flex stands for regular and this is the one that's most commonly used by our weekend golfers and the shaft of course is going to start to bend now a little bit more than the X did and then also the S did.As we work our way down, we want to have club shafts that are designed for different levels of golfers. One of the more popular ones is what we call an S or Senior Flex, or sometimes they might refer to it as a light flex. This is specifically designed for the senior golfers or also maybe even some junior golfers or better women's golfers. The final one that we have is what we call an L Flex, or it's designed for ladies. This is going to be the lightest one, it's going to have the most bend to it, which helps the golf ball get up in the air.So the thing you need to remember about the stiffness of the club shaft is that you want to get the right fit for you. The stiffer it is, you're going to have to have a higher swing speed, and you're also probably going to generally be a little bit better golfer. Make sure and find the right fit that matches your golf swing and your style.