On a Saturday morning last month inside a hotel ballroom in Manhattan, Noah Lyles opened the calculator app on his phone and reduced the outer boundary of our species’ athletic performance to ...

The 10-second 100-meter dash. The four-minute mile. The two-hour marathon. In baseball, is the 110 mph fastball the next big number to fall? What actually is the upper limit when it comes to ...

After running for over a decade, I wanted to see how healthy my heart is. I got an active metabolic assessment at Life Time, measuring my VO2 max and heart rate. I also learned which running speeds ...