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Is it possible that Usain Bolt could have run well below 9.58 seconds in training? - Quora

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Usain Bolt: I could have broken 9.5 seconds in 100m if I had super shoes

Usain Bolt says he could have run even faster with super spikes

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Usain Bolt says he could have run even faster with super spikes

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Usain Bolt is not a fan of those super spikes: 'It's weird and unfair for a lot of athletes

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The Science Behind Sprinter Usain Bolt's Speed - WSJ

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