Conversation so far:
Did Donnie Yen work with a trainer ?
Donnie Yen later went on to study the art of Parkour, Wrestling, Muay Thai, Kickboxing and Boxing under various trainers.
What kind of exercise did Donnie Yen do to bodybuild ?
Donnie Yen had to regain his muscular physique for the role and took 6 months through a very delicate and dedicated diet routine.
Was the diet for Legend of the Fist: The Return of Chen Zhen to gain weight or lose weight ?
To gain weight. Focusing on high-protein drinks and vitamin and mineral supplements, Donnie Yen managed to hit 165 pounds for the role.

Question: What other ways did he transform his look for roles ?
Self-contained rewrite: What other ways did Donnie Yen transform his look for roles ?