What can I do in the winter as far as physical activity?

I live in OKLAHOMA where it gets cold in the winter. While I'm really good at staying active in the hotter months with walking I can go up 10 miles round trip although I'm a really good swimmer I don't have access to a pool that includes a public pool. I'm 35 so I'm not looking to get a flat stomach etc. just wanting to keep my weight from going up over the winter. Thanks

What can I do in the winter as far as physical activity?
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