Ski Sunday's guide to the science of skeleton

2010 Olympic champion Amy Williams introduces a guide to the science behind the sport of skeleton.

Shelley Rudman, the 2012 world champion, compares the sport's testing and application of wind tunnels to that used in Formula One.

With Lizzy Yarnold winning this year's skeleton World Cup on Friday, Britain hopes to continue their recent success in the event at the Sochi Olympics.