Did you manage to snag a Fitbit at your work's white elephant gift swap? Then start the new year off by wearing it daily to take note of how active you really are, says Erin Palinski-Wade, RD, CDE, author of Belly Fat Diet For Dummies. "Awareness is key for weight management. Even if you go to the gym daily but are sitting for the rest of the day, you may be burning fewer calories than you realise," she said.