A good stunt has to have both style and substance. It's a combination of impact and notoriety, the element of danger, technical execution, and the skill of the stunt performer.

Stunt performing is a highly structured career path - you have to gain qualifications in six different sports to a high standard. It takes four or five years and costs at least £20,000; a black belt in a martial art from scratch costs a fortune."

Yakima Canutt was famously John Wayne's stunt double, and in the Western movie 'Stagecoach,' there is a fantastic scene where there are some horses thundering along, pulling a carriage. He climbs out onto the horses and drops down underneath them, so he's being dragged along, and then he lets go.

My whole life I've actually been training to be a stunt man without realising it. I've always loved extreme sports, and I now I get paid for it.