I generally dislike being in a rut so I've made a big change to my daily routine by moving my exercise period into the evening. I needed something to separate working time from relaxing time. For people with a regular job, this delineation is obvious. It is even worse when the work and the relaxing both involve using a computer, so the distinction between the two isn't always obvious. In the worst case, I'd just keep working and end up with a only a couple of hours to relax before bed time, which isn't good for the mental health.