No, 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
NIV Study Bible notes:
I strike a blow to my body and make it my slave. Here Paul uses the figure of boxing to represent the Christian life. He does not aimlessly beat the air, but he severely disciplines his own body in serving Christ. not be disqualified for the prize. Paul realizes that he must with rigor serve the Lord and battle against sin. If he fails in this, he may be excluded from the reward (see 3:10 – 15).