Self-discipline requires an honest look at your strengths and weaknesses. It is a long and steady course in learning attitudes that do not come naturally. Athletes are disciplined in their training. However, they do it for a prize that will fade away. Christians should be disciplined to run toward our Heavenly reward, which will not fade away—it is eternal. Bible study, prayer, and worship equip us to run with vigor and stamina in our relationship with God. So when I say to practice self-discipline, I mean to diligently train your body and spirit to be more like Christ. Our sinful nature will try to get in the way, so recognize your weaknesses and ask God for His strength. Then channel your natural appetites towards God’s purpose.
Don’t you realize that in a race everyone runs, but only one person gets the prize? So run to win! All athletes are disciplined in their training. They do it to win a prize that will fade away, but we do it for an eternal prize. So I run with purpose in every step. I am not just shadowboxing. I discipline my body like an athlete, training it to do what it should. 1 Corinthians 9:24-27a