It was Christmas morning. A bitter winter wind brought the chill down to near zero degrees. And the sun had not yet risen.
Yet there they were: almost 100 hearty men and women decked in gear that ranged from neon-green jackets to an elf costume to a Santa beard, running up and down the benches and steps of Harvard Stadium in Allston.
There were intermittent joyful hoots, yells of encouragement, a few bars of a Christmas song, and the thwack of palms meeting in high-fives.
But the constant sound that carried across the U-shaped arena was sneakers scraping their way up the shin-high concrete benches, padding down the closer-together steps, then working up to the top again in the next section. Full story for BostonGlobe.com subscribers.