Hey, so, I live in a city but visit my parents in the suburbs once or twice a year and at it did take some work, but there are certainly third spaces. After trying a few, I found some very comfy cafes to work out of, I prefer it since my parents can be a bit distracting. Also one cafe I really like is in a 'town center' which does also have a gym. So while you may not be in a city, see if there might be any pockets of walkability you can park at and enjoy the day on your feet.