I strike a blow to my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize. ~ 1 Corinthians 9: 27
It takes self-discipline to become a game changer and self-discipline is fueled by your expectations.
If you are tired of being tired... if you are frustrated with not reaching your goals... if you can't stop clicking on porn sites... you should forget about working on self-discipline. First you must come to grip with your expectations.
What do you expect of yourself? Ask God to help you see the man He sees.
To be the best version of the man God built you to be, you must expect to be that man. It will set the course of your discipline and drive your desired behavior.