How do you deal with low level anxiety?

What tools or coping mechanisms do you use to deal with low grade anxiety (that’s not constant). High stress life stuff, but not chronic mental issues, that you might light up a cigarette for (except obviously, that’s not a good solution). Thoughts? Tips? Ideas? It would be helpful if it’s something that you don’t have to leave the house to do, like, go to they gym would be nice, but it’s often not possible to leave kids/family at the drop of a hat to do so.