Featured in marathons
Why do marathon runners get the runs?
It doesn't just work your leg muscles—racing is rough on your intestines, too.
What extreme heat means for the future of the Summer Olympics
Experts are calling for changes ranging from the timing of events to the bidding process.
4 high-tech running shoes that could help Tokyo Olympians hit record-breaking times
Years of design, engineering, and testing have produced some very fancy kicks. Here's a look at a few neat pairs.
How Abebe Bikila won the Olympic marathon without shoes
Plus other wild Olympic facts from The Weirdest Thing I Learned This Week.
Eliud Kipchoge just ran a marathon in less than two hours—how much faster does science say humans can get?
The Kenyan marathoner says he expects many runners to follow his lead.
How Nike engineered its latest record-breaking marathon shoe
The shoe company's newest—and priciest—racing shoe has more energy returning foam and a more weather-proof outer material.
Science helped me run my first marathon in 3 hours and 21 minutes
Running is in our DNA, but training for a marathon is a careful mix of muscle, mental, and technological strength.
Humans are natural runners—and this ancient gene mutation might have helped
Your muscles are ready to run, whether you like it or not.
The weirdest things we learned this week: Lady Liberty’s big secret, the ultimate exercise hack, and a penis in a bottle
Our editors scrounged up some truly bizarre facts.
Nike put its energy-returning foam into a shoe you can train in
Feel fast everyday.