If you can walk fast, you'll probably run fast: The science of running faster

Every four years the Olympics and Paralympics give us a chance to see just what the human body is really capable of. Athletes at the peak of their abilities perform feats most of us can only dream of.

And perhaps the most enthralling of all is the contest when the fastest people alive step onto the track. In few other sports is there such a clear side-by-side comparison of performance.

"The thing about sprints is, you've got your own lane," says Eilidh Doyle, who specialised in the 400m sprint and hurdles, and won bronze for Great Britain in the 4 x 400m relay at the Rio 2016 Olympics. "It's not like the 1500m where people's tactics can directly influence you. You pretty much stand at the start lane and say, 'I know what the plan is, and I'm going to execute that plan, because nobody else can mess with that'."

At the heart of sprinting is a simple equation: running speed is equal to step length multiplied by step frequency.

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