By the numbers

Burning calories*

71: Number of calories burned in an hour of watching TV

143: Number burned in an hour of ice fishing

250: Number burned in an hour of snowmobiling

429: Number burned in an hour of shoveling snow or splitting logs

572: Number burned in an hour of cross-country skiing or snowshoeing

*Based on a body weight of 150 pounds

Source: www.bodybuilding.com