One of the more frustrating elements of training full time for me has been the slow rate of improvement. It would seem logical to think that doubling the amount of time you train (which is essentially what happens when you go from juniors to pro) will double your rate of improvement. Andre Agassi touched on this in his autobiography; his father had him hit one million balls a year, thinking that any 10 year-old who hits a million balls would be unbeatable. I think there is some merit to this theory, but overall increased volume does not equate to faster improvement. For a while I fell into this trap, thinking that I would naturally improve just by playing more squash. I quickly realized though that drilling and playing unconsciously does nothing to help you improve and can even be detrimental to your game. You have to be constantly aware of what is happening on court, what you are doing and why you are doing it. If you are trying to change something, be aware of it and make a conscious effort to improve it.