Science

Here's an exact breakdown of why 6'4" Michael Phelps has the perfect body for swimming

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Michael Phelps Rio Olympics
Adam Pretty/Getty Images

Michael Phelps is the most decorated Olympian ever, and his medal count at the Rio Olympics has continued to climb.

The swimmer has long been the modern Olympian with the most individual records. Now, he's even coming up against records set 2,168 years ago. As of August 10, Phelps had tied the ancient record set by Leonidas of Rhodes for the most individual wins (12). And he still has a couple more events to go.

So what makes Phelps such an incredible swimmer?

Many have pointed out that he has a perfect physique for swimming, and they're not wrong:

Michael Phelps graphic
Skye Gould/Tech Insider

In sports in general, there has been a sort of a "size sort" over recent decades, where athletes have started to focus on sports that they have an ideal body type for, Dr. Michael Joyner, a physician and Mayo Clinic researcher who is one of the world's top experts on fitness and human performance, told Business Insider.

Interestingly, said Joyner, elite performers in certain sports tend to be about the same size, as you can see if you look at rowers, gymnasts, and of course, swimmers.

Phelps certainly fits the bill.

But there has also been unproven speculation out there that Phelps has extreme qualities that make him such a good swimmer, such as the myth that he has double the lung capacity of the average human. (There's no actual evidence for this, and Dr. H. Richard Weiner, a swimmer and former team physician who practiced sports medicine at the University of Wisconsin-Milwaukee, previously told Scientific American that some of the claims about Phelps border on the ridiculous.)

While Phelps is certainly built for swimming, most of his competitors are too. They're tall, strong, long-armed, and frequently have longer-than-average torsos and relatively shorter legs. As "The Sports Gene" author David Epstein pointed out in a TED talk, even star water polo players share physiology that's different from the average person.

But it takes more than just build to get to where Phelps is.

As Weiner explained to Scientific American, physical advantages aren't sufficient on their own. You also have to have talent and technique, like Phelps' excellent stroke mechanics.

If you've watched Phelps during the Rio Olympics, you'll see that he has intense focus, drive, and a competitive nature too. All of those seem to be pretty important characteristics of a top Olympian.

It's the combination of all these factors that makes Phelps such an amazing athlete. Yes, his body is partly responsible, but that's not all.

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Kevin was a correspondent covering science and health for Business Insider. He covered climate and the environment, infectious disease, the limits of human performance, and more.  He wrote four stories for Business Insider's "Saving our World" series, covering the steps humanity will have to take to adapt to the effects of climate change, the ways rising seas will affect cities like Miami, how scientists are devising ways to bring coral reefs back to life, and potential last-ditch geoengineering efforts. He covered ways that fasting could potentially slow aging and fight disease. He wrote a Tech Insider feature profiling a scientist who thinks he could have a cure for all viruses: This man's potentially huge medical breakthrough can't get funding, so he's trying something desperate. He also wrote a launch feature for Tech Insider on the ways humans are using new genetic editing tools to reshape our world: The age of genetically engineered animals has arrived. At Business Insider, he wrote one of the first stories investigating the blood-testing startup Theranos: Scientists are skeptical about the secret blood test that has made Elizabeth Holmes a billionaire. Before Business Insider, he studied health and science writing at the CUNY Graduate School of Journalism. Before that, he earned a B.A. in political science and philosophy from the University of Notre Dame. He spent several years traveling and has written for Condé Nast Traveler, The Christian Science Monitor, and other publications.
Skye was the Design Director for Business Insider and Insider. She led the Graphics and Photo teams in producing all graphics, data visualizations, story art, photography, and special projects for the newsroom.