How many times did Usain Bolt break the 100-metre world record?

Widely considered the greatest sprinter of all time, over 100 and 200 metres, Jamaican Usain Bolt, who announced his retirement from athletics in August, 2017, requires little introduction. Individually, he won gold medals in both the 100-metre and 200-metre events at three consecutive Olympics – Beijing in 2008, London in 2012 and Rio de Janeiro in 2016 – and still holds world records at both distances.

On May 3, 2008, at the Jamaica International Invitation in Kingston, Jamaica, Bolt posted a winning time of 9.76 seconds, just 0.02 seconds slower than the existing world record, 9.74 seconds, set by compatriot Asafa Powell in Rieti, Italy the previous September. Four weeks later, at the Reebok Grand Prix in New York, USA, on May 31, 2008, Bolt broke the 100-metre world record for the first time, defeating reigning world champion Tyson Gay in a time of 9.72 seconds.

Less than three months later, in the 100-metre final at the Beijing Olympics on August 16, 2008, broke the world record again, winning in a time of 9.69 seconds, despite raising his arms in celebration 20 metres before the line when well ahead. A year to the day later, Bolt faced Tyson Gay again in the 100-metre final at the World Athletics Championships in Berlin, Germany, advertised locally as ‘Das Duell’. Tyson clocked 9.71 seconds but, even so, finished nowhere near Bolt, who crossed the line in 9.58 seconds, taking 0.11 seconds off his previous world record.

Why was Michael Johnson so fast?

Retired American sprinter Michael Johnson made history when, in 1996, he became the first male athlete to win both the 200-metre and 400-metre events at the same Olympics. Indeed, in the 200-metre final in Atlanta, Johnson produced a time of 19.32 seconds, improving on his own world record time of 19.66 seconds, which he had set in the US Olympic Trials just over a month earlier, by 0.34 seconds; his record stood for twelve years, until broken by Usain Bolt in 2008. Furthermore, in 1999, despite a season blighted by injury, Johnson won the 400-metre final at the World Athletics Championship in Seville, Spain in a new world record time of 43.18 seconds; that record would stand even longer, until broken by Wayde van Niekerk in 2016.

Johnson was recognisable not only by his specially commissioned, golden-coloured Nike track spikes, but by his unorthodox, upright running style, which attracted widespread criticism in the early days of his career. Conventional wisdom dictates that a high knee lift, which facilitates a powerful downstroke phase, is necessary for maximum speed over 200 or 400 metres. However, despite standing 6 feet tall, Johnson has a atypical vertical body type for a sprinter, with a long torso and short legs. His solution to transferring force into the track or, in other words, to generating speed, was to take short, choppy strides, but increase his stride frequency, or leg turnover. His statuesque, straight-up running style may not have been visually appealing to sprinting ‘purists’, but it was certainly effective. His ground contact time was measured at around 0.006 seconds and scientific studies of his style revealed that it was, in fact, much more efficient than traditional sprinting techniques.

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