Ryan Gosling's martial arts trainer has given the actor top marks for dedication as he trains for a new boxing movie.

Muay Thai master Kiu Puk tells Life + Style magazine the Drive star will wow film fans with his physique when he appears in Only God Forgives - and he deserves all the accolades and attention her gets for his perfect body, because he has worked hard to get in tip-top shape.

Kiu Puk reveals Gosling has been training for two hours a day, four days a week for the past two months - and he always comes prepared.

He says, "Ryan's disciplined and enthusiastic, and above all, he loves his training. He trains for around two hours at a time - it's pretty non-stop."

And Puk admits the actor is one of the easiest stars he has ever trained - because he does what he's told.

The trainer adds, "He's polite, always listens to what I'm saying and follows all instructions... I've recommended that he stick to a traditional Thai diet of fish, green vegetables and rice. I can tell he's sticking to it."