Human legs can only run so fast: Here's why

So far, the fastest any human has run is about 27 1/2 mph, a speed reached (briefly) by sprinter Usain Bolt just after the midpoint of his world-record 100-meter dash in 2009.

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Extremely steampunk leg attachments could let humans run 46 miles per hour

Human legs can only run so fast: Here's why The Arkansas Democrat-Gazette - Arkansas' Best News Source

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What prevents a human from running 40 mph? - Quora

How long does it take for legs to stop hurting after running? I'm running 2 kilometers every day for the past 12 days, but every time I stop, my legs hurt so

Would humans run faster if they ran with their legs and arms? - Quora