Under normal circumstance I will do quite a bit of running. At present I can't leave the house at all. But I have bought a skipping rope and hopefully next week I plan to get in my back yard every morning and do some skipping. Now there is just enough room to do it.
I understand what people are saying about getting out the house, plus physical and mental health. But and this is a big but, if you get this virus and die, your physical and mental health will not matter anymore. You might be the most considerate runner/cyclist/walker in the world, the problem is that you have no control over the actions of other people. You could end up with this virus through no fault of your own, it could be due the idiot behaviour of someone else.
Just stay at home. As others have mentioned, there are plenty of exercises you can do at home, you just have to be creative. Get one of them bike things with the online classes for the 2 week free trial and then send it back if you don't like it, buy a skipping rope or walk up and down your stairs for an hour a day.