One of the key fundamentals in squash is keeping away from the ball. You will always hear your coach talking about it. What we are looking for is to try and stay a racket to a racket and a half length away from the ball.
The reason this is so important as we need room to swing. If I get too close to the ball I don't have room to take a proper swing. I have to get upright and my swing is going to come up and down and it will be difficult to control the ball.
If I give myself a bit of space, about a racket to a racket and a half length away, I have lots of room now to swing through the line of the ball and hit a nice accurate shot.
The second reason why we do not want to get too close is because it is inefficient moving wise. If I come in too close to the ball here I am moving further from the 'T'. It is extra effort I don't need to use and it is going to make it harder to get back as well.
Our problems with getting too close are exadgerated in the back corners. If I get too close I have no chance to swing because the back wall gets in the way. By keeping away the back wall is also out of the way. I can swing and at least boast and with a bit of luck I might be able to pull that round straight.
Of course, the same issue here with distance from the 'T'. If I get too close to the ball it is not going to help me hit the shot, but also look at my distance from the 'T'! I am a long way away. If I keep away it helps me get the shot back and with one step, even with my short legs, I am half way back to the 'T'.