At first glance the annual Man vs. Horse Marathon, set for Saturday in Wales, seems like a joke sport brought to us by the same brilliant minds behind dwarf tossing and gravy wrestling. It was, after all, the product of a pints-fueled debate in a Welsh pub, and for years its official starter was rock musician Screaming Lord Sutch, founder of the Official Monster Raving Loony Party. But the jokiness is misleading: When viewed through science's clarifying lens, the funny marathon is one of the few sports that isn't a joke.

Hear me out, sports fans — I'm a basketball nut myself, and so the joke is as much on me as anyone. To see where I'm coming from, you can't do better than examining basketball's most physically talented player, Michael Jordan. He was hailed as nearly repealing the law of gravity, and during his prime he made rival players look as if they were moving in slow motion. But Air Jordan wasn't in the same league as a house cat when it comes to leaping. Consider how casually young cats can jump up onto refrigerators. To match that, a man would have to do a standing jump right over the backboard. And a top-notch Frisbee dog corkscrewing through the air three metres up to snag a whizzing disc makes Jordan look decidedly human when it comes to the fantastic quickness, agility, strength, and ballistic precision various animals are endowed with.

And the winner is ... competitors in the annual Man vs Horse Marathon.

There's no denying it — our kind started substituting brains for brawn long ago, and it shows: We can't begin to compete with animals when it comes to the raw ingredients of athletic prowess. Yet being the absurdly self-enthralled species we are, we crowd into arenas and stadiums to marvel at our pathetic physical abilities as if they were something special. But there is one exception to our general paltriness: We're the right honourable kings and queens of the planet when it comes to long-distance running.

The Wales marathon has helped demonstrate that. Its originator was a Welsh pub owner named Gordon Green. One day in 1979 he got into an argument with an equestrian friend about the relative strengths of men and horses as distance runners. Green insisted a human could beat a horse in a long race, and to prove his point he helped instigate the marathon in 1980. For the next 24 years, he found himself losing the argument as riders on horseback left human runners behind. But then it finally happened — in 2004 a British man named Huw Lobb won. Three years later Germany's Florian Holzinger outran the horses, as did one other human contestant. The media loved it — a predictable farce had become a man-bites-dog story. Bookies were less enthused; they had to pay out on bets made at 16-to-1 odds favoring the horses.