You could if you think you’ll use it. I’ve got one and nobody ever uses it.
If the weather permits, you might be better just going for a walk though. It’s cheaper and an effective way to get exercise and you’re out in the fresh air and seeing the world. All you need are walking shoes and socks. You can even go for a walk when it rains and get the added benefit of jumping in puddles.
I’ve just read your other question about alternatives to walking outside and why you don’t want to do that. I’ll answer that there.