’Twas the week before Christmas, Hanukkah, and Kwanzaa, and two weeks before New Year’s, and you have been eating and drinking like . . . well, let’s just say you have been enjoying the season’s festivities quite a bit. Go out and get some exercise Sunday, Dec. 18 at Fleet Feet Sports’ Holiday Classic. The 3-mile run/walk starts at 9 a.m., with registration at 8 a.m. (So don’t worry, you can still make that party on Dec. 17.) It’s free, but Fleet Feet asks that you bring an unwrapped toy—maybe something similar to this adorable blue and orange stuffed animal thingy shown—for a child in need, which will be donated to The Salvation Army. In exchange, FF will be handing out “leftover” race shirts. So by the end of the day, you might be sporting a nice technical fabric (that’s running geek terminology for fabric that wicks away moisture) shirt stating that you participated in a half marathon! Coffee and hot chocolate will be provided at the end. One year, there were post-event pastries. Yes, bona-fide pastries—not apple chips, not oatmeal, not even bagels—pastries! Not sure if there will be pastries this year, but there will be holiday cheer. Maybe a little sweat, too, but a good sweat. The event starts and ends at Sutter’s Landing, 28th and A streets.