I don't remember how I started with meditation, but it was working in data entry that prepared me for it. Figuring out how to speed up my typing led me to the realization of how the mind is just layers of processes, and how training through repetition is just a matter of setting up a cue/response behavior in sub-conscious processes. Which can be physical (training to hit a baseball or ride a bike) but can just as easily be mental (training to become calm on cue).