Good options when you can't afford a gym (and it's cold outside)

What are some things you all do at home to stay in shape?

There aren't any gyms around where I live or work that are less than $40 a month, and I simply don't have the extra money. I really prefer to get outside and move, but I live in the Midwest and it's nasty cold right now.

Good options when you can't afford a gym (and it's cold outside)
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