Seems to me like most people either concentrate on strength or endurance exercises in most sports, including tennis. It's sad but I don't know anyone that focuses on improving their balance. I have also met very few fitness trainers that ever touch on the subject of balance. Of course, I do see maybe 2 out of 50 people at my gym working on their balance, but that's still a very low number. Honestly, I'm also a victim of this. I know that balance is important in pretty much everything that we do. Yet, it never occurred to me that I should work on improving my balance until a couple months ago. It just seems that the issue overall is never talked about, therefore most people don't even remember that it exists. Just to have a point in my post, I have started working on my balance a couple months ago and I notice a huge, HUGE improvement in my tennis performance. I notice that I can recover a lot faster after being pushed off the court; I notice I can transfer my weight a lot better; I notice that my serves are much more consistent and powerful, since I don't lose my balance during my service motion anymore. I have also notice that I can still hit pretty powerful shots when I'm out of position or when I get to the ball in an awkward position. Overall, it's just an amazing experience that I would highly recommend for everyone to give it a go.