Wow! Fascinating thought!
I know my mind craves exercise such that I occasionally have to remind myself to take a break for the sake of my body.
I had a spin class yesterday that I decided to skip because I had been working out (cycling and weights) hard for 8 days in a row and was my legs were just out of gas (I do two spin classes a week that I consider "race day").
BTW, the exercise keeps me on a very even keel.
Back to your point, I have noticed that both dogs and horses crave exercise and seem to get depressed when they don't get it. Probably the same for humans...hence your point!
That’s how I see it - all this is pretty mainstream thinking nowadays - it’s just the idea that “drug seeking behavior is really just a perverted form of exercise seeking behavior” that is the twist, if you will. My dog is the same way too - of course maybe I just made him that way! :)