Having a class you can go to like boxing or yoga or whatever or even just the gym is really good, at least it works for me. If you're thinking about work outside of office hours that much though maybe time to evaluate the root of it.
Find out the root of your stress. What part of work do you think and stress about?
Maybe you could also talk to the management or other coworkers if they feel the same way too. May not be you but the working environment or the nature of your job.