The metric system has been in play since 1799.
And all these years, the magic number of kilometers required for a day of competitive fun with an accompanying souvenir T-shirt has been five.
But for organizers of the Dallas Marathon, 5K is just not enough. This Thursday, you're cordially invited to participate in the tradition-bucking Dallas Marathon Kickoff 6.4K.
That extra 1.4 kilometers gives you even more time to enjoy picturesque White Rock Lake in an un-timed race that ends with an evening in the Miller64 Beer Garden (ah, now we get it!) with plenty of free brews. There will also be food trucks and live music by Sylvanshine playing into the night.
It's all in celebration of the opening of Dallas Marathon registration on June 1, which gives you six months and one week to get in tip-top shape for the big event on Dec. 8.
Good thing that beer's only 64 calories a bottle. (No, they didn't pay us for that plug, promise.)