What cardiovascular exercises to do in the winter?

I was wondering what can I do in the Winter to keep my cardiovascular health in check. I live in michigan and it's is like high 20's right now and I would run but I dont know if that's normal when it's this cold.I get chest pains when I dont run often so what else could I do to keep my heart exercised. show more I was wondering what can I do in the Winter to keep my cardiovascular health in check. I live in michigan and it's is like high 20's right now and I would run but I dont know if that's normal when it's this cold.I get chest pains when I dont run often so what else could I do to keep my heart exercised.
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