Even fitness fanatics are discouraged by the winter weather. Here’s the good news: you can significantly increase your overall calorie burn with everyday activities—so called “incidental exercise.” Unpacking the car for 10 minutes burns 30 calories. Straighten up the house for 20 minutes and use up 62 calories. Skip the escalators and elevators: 10 minutes of stair climbing burns 107 calories. Shoveling snow for 45 minutes will torch 342 calories.