'Horse thunder' is what I call the sound of galloping hooves.

Being on the ground in Mongolia and traveling with the horse culture and sleeping in yurts, I was able to pick up a lot of detail. But I brought in advisors to work with our horse master to make sure the fighting strategies both on the Chinese and Mongolian sides were very accurate.

In 2007, I did a horseback trip across part of central Mongolia with my 13-year-old son - we encountered Marco Polo at all these historical places where Mongolian nomads would reference his accounts and his relationship with Kublai Khan.

I have seen too many screenwriters of promise become formula addicts and slaves to stop watch structure. Spend that time watching movies, reading screenplays, reading plays, and most importantly - write from your gut.

If you understand the importance of developing a relationship with the director and making that director see that you're the best technical adviser and resource in the world on your subject, you'll be invited on set as a respected and integral part of the process.

In many ways, it's easier to write a book. You have more latitude with structure, and you have the freedom to luxuriate within the internal lives and musings of your characters. But where a screenplay does not always demand great prose, a novel lives or dies by it.

The journey of Marco Polo is the hero's journey, one that all cultures across the globe can relate to.

I started looking into horse history books and came across the actual story of this half-breed endurance horseman and his painted mustang Hidalgo. I wasn't really sure if I was going to do the movie at that point.

At a young age, when I was fascinated with China, I read 'The Travels of Marco Polo' and learned about this exciting, dramatic world he captured and reported on. He's so little known, but yet this mythology has survived that's so misrepresentative of his story.

They never folded. They never quite out there and we did have a chance at the end to win this basketball game, and that is all you can really ask for as a coach.