How to lose weight during winter?

I walk three miles daily 'tween late April and Oct. The rest of the year, we're locked in by snow or ice: the sidewalks aren't plowed (budget cut-backs), the snowbanks extend to the edges of the roads. There's no gym within 20 miles. I've no garage or basement for skipping rope, running in... show more I walk three miles daily 'tween late April and Oct. The rest of the year, we're locked in by snow or ice: the sidewalks aren't plowed (budget cut-backs), the snowbanks extend to the edges of the roads. There's no gym within 20 miles. I've no garage or basement for skipping rope, running in place, etc. What to do?
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