I've actually read quite the opposite a few times.

If you focus on the end-goal you can easily get frustrated once you don't see any results, specially on such long-term goals such as graduating, improving your career or becoming buff by doing exercise.

Supposedly it's actually better to just try and find meaning and joy in the process itself, enjoy lifting/studying regardless of the end results.

Obviously none of this is an exact science so each person might think different.