But my adult life (I am 28 now) went nowhere precisely for this reason.
As a kid, I could literally skip all classes and homework, then figure the subject "on the spot" during tests, and score high enough to still pass.
This doesn't work as adult, but I don't know how to do it right now...
Learn through the gym how to enjoy the process more than the milestones, and apply the same mechanic to other aspects of life. What's the next 2% improvement you can make to anything in your life?