I do exercise to keep thing ticking over. 5km jogs. You hear of people who experience feelings of well-being, even rushes of euphoria, to which they become addicted. Who *are* these people? Sport/exercise to me has always felt like being dragged around a field by a rabid bull. A necessary evil.
@Richard_Littler it takes a while to get the positive effects. Few weeks of feeling sore and tired usually. Even then, maybe the activity is not for you.
I tried to take up running and always hated it and found it boring, even after giving it a good honest try.
Lifting weights worked for me. But first it was weeks of feeling weak, and being uncomfortable with the mirrors everywhere. Once results piled up there was no stopping me.