Some people get literally high when running. Some don’t. The get high types invariably posture as if they have more dedication or willpower. Funny stuff.
Now that said I don't think living your life as though you have no free will is a good life strategy. The illusion of free will is incredibly important. Fortunately we humans are masters at living with cognitive dissonance and inconsistent beliefs
I definitely do not believe we have free will in the most traditional sense, but I am a sort of compatibilist: its clear we cannot make a different choice in identical circumstances for meaningful reasons, but identical circumstances never occur anyway. A person's psychology is a sort of accumulation of all their experiences into biases for future behavior and our "will" is really just a manifestation of those experiences. But to whatever extent we can curate those experiences to produce a long term psychology that we like, I think we should do it.