more thoughts:
MA offers cyclists range of motion, flexibility, balance, fast reaction time, spatial skills, and good falls for when you endo.
I find is that for Aikido anyway, Aikdio calm feels good, calm yet prepared. I've tried meditition and I feel a little dead.
It's a lifetime practice, find a teacher, style and school you feel comfortable and safe with, shop around, talk to people, watch the class.