For some time, I’ve marveled at the appearance of world class sprinters. While swimmers in high school shave their legs, Olympic sprinters often run with hair extensions and jewelry. It sure seems like that would slow them down, right?

Over at Wired, physics professor Rhett Allain has crunched the numbers. It turns out that the impact of the extra weight of jewelry or the wind resistance from long hair is almost infinitesimal.

Without the jewelry, you’d have a time of 11.8674 seconds. Adding the bling we get a slower time of 11.8683 seconds.

That’s a difference of .0009 seconds. In this year’s men’s 100-meter sprint, the finish was historically close. Though USA sprinter Noah Lyles ran with a thick chain around his neck and a chunky watch on his wrist, he was declared the winner by .005 seconds, in a photo finish. Fortunately for Lyles, he did not run with five or six chains and watches.