Advent calendars are used to count down the days between December 1st and Christmas Eve. Often shaped like a thick book or plank, advent calendars are typically filled with chocolates or other small gifts that can be revealed as the days are counted.
Traditional advent calendars were first used in Germany in the 19th century; today novelty advent calendars are most often filled with small chocolates. Increasingly, special niche advent calendars can be purchased. There are wine and beer advent calendars, calendars filled with dinosaur toys, makeup and jewelry, tea, LEGO sets, and much more.
But there doesn't seem to be a commercially available advent calendar for runners.
That's ok -- there are plenty of empty DIY advent calendars that can be filled with anything you can imagine. If you're looking to give an advent calendar to a runner friend, here are some ideas to fill those 24 boxes.