Working out in the winter

I walk when the weather is good. Last year I started using a Total Gym (Chuck Norris, Christy Brinkley) during bad weather days.
There are other brands like Gr8Flex and you can get them used pretty cheap. Find a better model with a tall foot rest and all attachments. Works great. Folds up small. There are a few youtubers with workout routines to suit your desired goals.