Kindling a Fire: 112 Calories/Hour

You could pedal for 15 minutes on a stationary bike at the gym, or you could spend an hour building and tending to a fire at home. Both activities burn 112 calories. Bonus points if you harvest and chop your own wood: Chopping and stacking firewood burns 373 and 298 calories per hour, respectively. Combined, it's the same amount you'd burn in an hour of swimming laps. And if you're looking to get extra-cozy in front of the fire, know that cuddling burns about 22 calories per hour.