Hey I got this exercise from a Chick Corea instruction DVD...I have big problems, that I know how to hide lol, with using my hands together. A concept Chick gave was to imagine your ten fingers as drummers here's an example...
Do all of these as sixteenth notes:
LH: AbBb
RH: DCB
LH: GbAb
RH: BAG
LH: AbBb
RH: EDC
LH: DbEb
RH: GFE
LH: EbGb
RH: FGA
LH: DbEb
...LH=left hand; RH=right hand
Make the motion constant, I also encourage doing these with a metronome or drum machine, with probably getting at least to 100 bpm 4/4 time
Hope this makes sense