Anything that works your legs is good anytime. As for the specific muscles of umpiring, I pop a video in and call the balls and strikes along with the plate guy. He misses a lot more than I do, by the way... This also works your timing. To tune your basework, get in front of a mirror and do the old umpire school "safes and outs". You'll see your mechanics and can modify them instantly.
Books and videos about balks...there's a video called "See a Balk, Call a Balk" that's been around quite awhile, but (in my opinion) it isn't very good. The 1997 NCAA Rules Video had a good section on what the NCAA considers a balk, with Bill Thurston (former NCAA Rules Editor) doing the demonstrating. Of course, that was a few years ago and not all the info is valid anymore. The guys at EUmpire who post here should have a lot more resources they can point you toward. As for books on balks - nothing beats seeing demonstrations, which is probably why there aren't any great books on balks, either. Making it more complicated is the fact that what is a balk in Fed may not be in NCAA may not be in Pro may not be in LL ad infinatum.
Work your legs, get your heart rate up, and yell for a couple of hours at a time (then you won't lose your voice the first week of the season). People will look at you strangely and you won't have to wait in line at the grocery store (folks will let you go first). Have at it.
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