When thinking about signing up for a December race, it is hard to imagine getting all bundled up to run hard in the frosty weather. On the other hand, it is fun to picture getting all decked out to “strut your stuff in your favorite holiday costume.” Complete with jingle bells, of course. The Jingle Bell Run has 5K and 1-mile run or walk options for the adults. Plus, a 1K Kids’ Fun Run, where…