Personally I run an hour per day outside. It's not just the exercise. I'm aware there are more time efficient ways to work out, but there is also the aspect of

Personally I run an hour per day outside. It's not just the exercise. I'm aware there are more time efficient ways to work out, but there is also the aspect of emptying your mind and getting away from distractions. I know some people find this really boring, and there may be reasons it's not feasible for some, but if you can get into the habit, it is great for stress. The key for me is to not let any excuse break the habit. Every day there is some reason to skip the workout, so don't give yourself a choice (unless you have a respiratory infection).