Get moving. Counteract those extra calories that are bound to sneak into your mouth despite all your good intentions. Just get up and take a walk, feel the crunchy leaves under your feet. Smell the fresh air. Look around and take in the real world. Unplug for just a few minutes. You’ll like it! “On the actual holidays get some HIIT in - high intensity interval training,” says Kristin Russo (KrisRusso.com), an ACE Certified Group Fitness Instructor based in New York City. It boosts the metabolism and keeps it revved for up to a couple of days following.