Scientists are calling it the "Usain Bolt Effect" because he has significantly improved the average performance of the world's top sprinters, who are now suddenly running about 1 per cent faster than ...

Bolt exploded on to the scene at the 2008 Beijing Olympics when he claimed three golds and clocked an astonishing 9.63 secs but he bettered that the following year when he became the first man under 9 ...