You may want to really go to a gym (meaning broadly, any type of physical activity, if it's not a gym but running or biking or anything else for you, it's fine) more. It's amazing how getting regular exercise (and I don't mean just walking around the block, something that really makes you sweat and pushes you to your limits) has positive influence on your mental health - yes, including the work stuff. It's hard to believe until you really experience it, but I can tell you from my experience, if you feel frustrated after a bad work day, there's nothing like putting your big brain on neutral for a while and do some physical exercise, and then you'd be surprised how much better you feel. Do take that hour - it will pay for itself, you'd get much more back in better productivity and better mental (and physical, obviously) health.