Conversation so far:
where was mike's childhood years?
Piazza was born in Norristown, Pennsylvania, grew up in Phoenixville, Pennsylvania, and.
where else did he grow up in?
CANNOTANSWER.
what is interesting about his childhood?
Tony, and Tommy.
Mike grew up a Philadelphia Phillies fan, and admiring Hall of Fame Third baseman Mike Schmidt.
did this admiration make him a baseman?
Piazza's childhood friend Tommy Lasorda, the godfather of Mike Piazza's youngest brother, Tommy--visited Philadelphia, Piazza visited the Dodger clubhouse and served as a bat boy in the dugout.
what was the outcome of this bat boy service?
He saw that Mike Piazza had potential in the sport, and began encouraging his son to build his arm strength at the age of five.

Question: what other training did he receive?
Self-contained rewrite: Besides training his arm, what other training did Mike Piazza receive?