There's a certain amount of physical activity your body has to have, and if you don't give the body that physical exertion, it won't feel good. We've evolved to hunt, gather, build homes, and survive from predators. We carry around all the burdens of this past, and there's no getting around that. You can either deny it and just deal with all the tension; or you can exert your energy, find some way to calm your mind, and live a life that's better.