QUOTE(chocolatedog @ Jul 23 2007, 01:49 PM)

Yes I would always say you should sit opposite middle CD generally - and I agree with sbhoa's query - feeling "cramped" is possibly more likely due to sitting too close. The arms need a lot of space in front of you for good freedom of movement. Generally speaking, you should be able to cross your LH across yourself to play the very top note on the piano, and your RH across yourself to play the very bottom note without feeling cramped at all....the edge of your knees as a general guideline should only just be under the edge of the piano....
When I go home I'll investigate whether I'm the right distance away from the keyboard. There are times when I need to sit back
a bit more when I have to use my right hand below middle C.
But I've noticed that my muscles are different on the different sides of the body (I look completely normal in case you're
wondering

) and that scales at the bottom of the keyboard need less conscious adjustment e.g. lean of body etc than scales at the top.
I would think it was normal for one side to be stronger and more flexible than the other in any event.