Reading has always been something that I have loved. You can be transported into a whole new world. Right now I find that I am needing that more and using reading as a way to unwind before bed.
For people with dogs this is probably very easy because the pups need walks right now too. But walking in general can be so calming. Getting up and moving, looking at something new. Being in nature, and breathing the fresh air has been amazing for my anxiety.
No, you cannot go to the gym. However, you can pull your phone out and get a video of an in home work out. Get your body moving and focusing on something else.