Hello!
Not sure what field my issue is related to, but I believe there is neurology involved. I play drums and piano, at a pretty high level, and since young I have noticed a rather annoying difference between my left and right sides.
It's especially bothering for drums, let me explain : I seem to be unable to develop speed with my right side (although I'm right-handed), either with the foot or the hand. I can move my left fingers (which control the stick) and ankle repeatedly to play fast single stroke rolls, but the exact same motion applied to my right side just doesn't work. My muscles kind of "freeze" and all I can do above a certain speed is to try to force the motion either with the arm (or thigh) or by using tricks such as "push pull" motion which brings no power nor consistency.
Eventually I can sort of "control" a shivering of the wrist/arm to play very fast notes but the range of such a technique is very limited and sometimes I don't have the tonus to get that shivering.
So, to make it short, despite lots of exercises (practising slowly, isolating fingers...) and brain-storming during the past years, there has been absolutely no progress whatsoever and worse, I developped a recurrent tendinitis in the right arm. Apparently my case is quite uncommon. Most right-handed drummers have no problem getting their right side up to speed with single strokes.
Could it be a weird neural structure? If so, is there any way to change? I must add that I have absolutely no problem playing fast phrases on the piano with my right hand, as long as it doesn't involve repeating notes at short intervals with the same finger. No problem either to play fast drum licks like double strokes or paradiddles.
Again, this is really an issue of moving the same finger (or group of fingers, or ankle) "up and down" repeatedly above a certain speed. Like 8th notes at 170 bpm or so.
Many thanks,