I think I should actively play out my brain's "grass is always greener" mechanism against itself more. When I'm working out I also keep having ideas about work

I think I should actively play out my brain's "grass is always greener" mechanism against itself more. When I'm working out I also keep having ideas about work and wanting to work, and when I'm sat down I feel like doing something physical. Or I just want to hit my bed. But then when I do, I keep thinking about work and want to get up and do it. One thing about the gym is that I find it best to do it either around the 4pm mark, when we're in our energy low, or at night also when we're tired. We're mostly tired because of our brains, and doing exercise recovers my mental energy like nothing else.