What's the key to world class sporting performance?Top coaches will tell you the biggest prizes don't necessarily go to the best natural athletes, but to those best prepared. Science, technology and psychology - all are used to gain a competitive edge. Stephen Sackur speaks to Sir Clive Woodward, coach of England's World Cup winning rugby team in 2003, and now performance director for the British Olympic team preparing for London 2012. Are sporting champions born or made?(image: Sir Clive Woodward. Credit: Getty Images)