How fast can a human run, really?

And that’s just distance runners. Catch a sprinter smashing a speed record and they look like they could keep up with a car chase.

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The current fastest human in the world is Usain Bolt, who can run at nearly 28 miles per hour-some streets have lower speed limits than that! Bolt holds the record for the 100-meter sprint, clocking in at 9.58 seconds, reports BBC. Christian Coleman, however, broke a world record earlier this year for the 60-meter dash, coming in hot at 6.37 seconds, and some argue he’s now worthy of the fastest title.

And for the ladies, Florence Griffith-Joyner has the fastest 100-meter at 10.49 seconds, according to the IAAF. That's 22 MPH!

No matter who holds the top spot, whenever I see these outlandishly fast humans, one word comes to mind: how? How can a human be so damn speedy?

Of course, Olympic, record-breaking athletes don’t just show up to the Games without putting in intense hours of training. But they also have genetics working in their fast-paced favor, says Colleen M. Brough, P.T., D.P.T., director of clinical education at the Columbia RunLab.

To run at the speeds most elite sprinters do, you need a certain amount of type II and IIx muscle fibers-the fast-twitch ones that provide, quick powerful movements but burn out quickly, says Brough. Most people have about a 50/50 split of type I (the kind that power you through endurance runs) and type II fibers. “But for elite runners, like Usain, they have a higher percent of type II and type IIx fibers. Genetically, they’re going to have an advantage.”

Meanwhile, other people are predisposed to having more type I fibers, so they’re born to run stronger for longer.

You can certainly train for a speedy finish. You just might not snag world records if your DNA isn’t set up for success.

Power movements (think jump squats and other plyometrics) and strength training are important for those aspiring for speed-though, of course, a little cardio helps, too, Brough says. And, “when it comes to power, these sprinters need to focus on maximizing glutestrength."

With better butt strength comes a focus on muscle activation and stronger run form. The fastest runners tend to have a forefoot strike (when you land on the front of your foot) and a strong knee drive, says Brough. “It’s almost as if they forcibly push it down and shred the ground beneath them."

According to a 2010 study, yes. Because of the force muscle fibers take on, it appears 40 miles per hour might be the cap speed. Considering Bolt is more than 10 miles per hour below that, humans have some work to do. But Brough says we’ve come a long way over the years in terms of increasing speed overall.

“We’re expanding areas of exercise science, and discovering more efficient running form," says Brough, "as well as ways to maximize energy production and utilization,” to help runners get stronger and faster.

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