If you already have a consistent fitness routine, it's probably exactly what you need to keep stress at bay—breaking a sweat helps reduce cortisol while boosting feel-good hormones like serotonin and endorphins. Regulating a healthy balance of these hormones also helps normalize your metabolism, even when you're consuming more sugar than usual. Not to mention how working out "will also help maintain lean muscle mass that helps your metabolism thrive," adds Griffin.
Your most effective option will likely be HIIT training, says Darby, since it functions as a form of metabolic conditioning: Switching off between periods of rest and high intensity encourages an afterburn effect unrivaled by other workouts. But that said, you'll reap plenty of benefits just by getting moving in any way.
"Maybe you and your friends take a Spin class before your annual gift exchange brunch," says Darby. "Or instead of browsing the internet for holiday gift ideas, head to a local shopping strip and see how many stores you can hit up in a limited amount of time. Zipping through stores will certainly get your heart rate up, and depending on the size of the crowds, bobbing around people absolutely counts as agility training."