I think what some of this discussion is missing is there are two continuous scales of wanting exercise. There is the axis the GP speaks of of wanting to exercise (for me, because of the endorphin rush) but also an orthogonal axis of laziness/busyness/inertia/etc that fights the first desire. I’ve found it common to both intensely want and simultaneously not want to exercise — and eventually one axis out-weighs the other.

It is similar to the HR principal (forgot the name) where employees can both intensely like the job but also dislike it — all because the continuoum is on a single axis one.