I think motivation is the single most important component of running. I mean unless you have some physical condition or heart defect type problem everything else can be worked on or compensated for.
The thing that gets you to switch the ps4 off is the same as the kind that keeps you pushing hard in the last mile of a marathon when the wheels are coming off. Or that gets you to kick for home on the final straight of a parkrun.
For most of us there's no money involved. Nike and Santander aren't offering endorsement contracts. nobody sticks a news camera in your face.
None of this masochism makes sense really. We just want it (for whatever reason) so we do it. Again and again.