I fully agree with the answer regarding the development of hands through playing musical instruments. I can add that not only the game, but also the preparatory exercises for drummers already significantly improve the motor skills of the fingers, flexibility of the hands and the uncoordinated hands
I personally learned from cards, who is interested in google cardistry. Nerves play pranks when studying, but it's worth it, it develops fine mathematics perfectly, I can perform two different florishes (tricks), in both hands, without irud.
Start playing the bowed strings. After some (quite a long time), you will perfectly be able to perform a huge number of actions with your right hand that control bowing, with your left hand - even more movements of your fingers and a hand that control pitch, vibration intensity, transitions, etc.)
Well or pianists, then learn polyrhythmy, when one hand will play a three-beat, the other - a two-beat, for example. Well, or different components.
The same can be said about drummers, only their legs are very actively used.