Usain Bolt showed
his dominance of men's sprinting at the athletics World Championship in Beijing
this week with wins in the 100m and 200m. What's his secret? Is the way to win
at sprinting to move your legs faster than your rivals do?
Since the Beijing
Olympics in 2008 Bolt has won every race he's entered at a World Championship
or the Olympics, with the exception of one, where he was disqualified for
making a false start.
When non-athletes
want to run fast they set about moving their legs as fast as they can, so you
might assume that Bolt has achieved this exceptional record by making his legs
move faster than everyone else has. But this idea doesn't stand up - in fact,
it falls flat on its face.
"Elite
sprinters don't swing their legs any faster than recreational runners,"
says Dr Sam Allen of Loughborough University.