Conversation so far:
What did e do with martial arts?
won gold medals.
when did he start learning martial arts?
learned Tai Chi from a young age under his mother's tutelage.
did anyone else teach him?
Beijing Sports Institute, the same facility where champion-turned-actor Jet Li trained.
how long did he train there?
CANNOTANSWER.

Question: What was his style like?
Self-contained rewrite: What was Donnie Yen's martial arts style like?