QUOTE(bobziekins @ Jun 29 2009, 09:57 PM)

My right hand is a lot stronger, more flexible, and a lot easier to coordinate than my left.
Which makes it quite hard on the piano. It's weird, my left hand can't play things easily without the right hand leading it. It's impossible to sight-read, my fingers won't go to the right keys etc.
I can easily pick out a tune on the right hand with the piano, but with the left, it's near to impossible.
Is this due to strength, or just making the brain coordinate it? My flute teacher heard me mentioning it, and told me that a stress ball just playing around with my left hand would help. Wouldn't this just make it stronger, but possibly clumsy?
I was concerned about exactly the same problem and told my teacher about it and she insisted that doing Hanon exercises HT and HS would do the trick. I was not satisfied, though, and got hold of a book called "Training of the Left Hand" by Berens (Peters Edition), which I spoke about on the Forum some time ago. Although some Forumites said this was a well-known book, Tortellini agreed with me that this is not the case in Italy. The book consists of 4- or 5-line exercises (and studies in the second section) only for the left hand and for about one and a half months now I've been doing the 10-minute practice a day the author recommends. Well, the touch in the LH has considerably improved and the physical sensation has changed completely. Thes sensations come back to me on several occasions when I'm playing Etudes, or Bach or other things and I believe that given the noticeable difference in strength of the LH in comparison with the RH (often extremely marked), everybody should tackle at least one of these exercises every day.
Another approach - not as an alternative but as a complementary technique - is doing études where the LH has an active role (runs, melody, scales, etc.) but nothing can beat daily disciplined practice of the LH only (mind you, without using the RH as the attention must be totally focused on that so the brain is completely free from distractors). It is a muscular process but, above all, it is a mental one, that is, giving the LH the chance to work undistracted and with total cocnentration. It does work!