For great athletes, the margin between winning and losing is razor-thin—a hundredth of a second, a fingernail length over the finish line, a momentary lapse in concentration. Which is why Team USA has employed a secret weapon in the run-up to the 2016 Summer Olympics in Rio de Janeiro: technology. It should come as no surprise to the rest of the world that the country that brought you Silicon Valley is now turning athletic training on its head.

This article was originally published in the July/August 2016 issue of Popular Science.