Exercises for your fingers?

[TinkoKoala]

Hey i was wondering if anyone knew of any good exercises that you can do to make your fingers stronger, in essence reducing any fatigue you may experience while playing a song on FFR. I believe there are 2 things to this game, being able to see the arrows and being able to keep up with your fingers. I have the seeing part down pat, but at the moment the only thing stopping me from full combo-ing CIA rave is finger fatigue. So, can anyone help me out here?