Based on the way people write about him, you wouldn't think Santa's much of a fitness buff - anyone whose stomach "shakes when he laughs like a bowlful of jelly" probably isn't hitting the treadmill too often.
But two annual events in Scotland - the Santa Dash in Glasgow and the Great Edinburgh Santa Run - show a very different side of Kris Kringle.
Thousands of people came out yesterday in those cities dressed in red-and-white suits, beards and sneakers to raise money for charity.
Glasgow City Council's nominated charity was Malawi Leaders of Learning, which supports schools in the African country. The 2,500 people who showed up for the five-kilometre race were free to choose their own charity, as well.
The winner of the Glasgow race was Congolese runner Gillet Gaelo, who ran the full 5k in under 20 minutes.
In Edinburgh, proceeds from the 1.5-kilometre run went to When You Wish Upon A Star, a charity that sends Scottish youngsters with life-threatening illnesses to Lapland.
Those weren't the only mass gathering of running Santas this weekend, though.
In Michendorf, Germany, about 800 people came out for the annual Santa run, which was a long one: 10 kilometres in heavy snow.
And of course, there's the Budapest Santa run, where bowls full of jelly have nowhere to hide. Because everyone runs in their underwear. All the proceeds from that one go to children's charities.
Speaking of Christmas, make sure you tune in on December 24 for a special Christmas eve edition of the show. George will be sitting down with the Queen of Country, Dolly Parton, and our favourite yam, Mamma Yamma, will join the Three Things panel. Holiday spirit: guaranteed.