The Greek verb doulagōgeō (δουλαγωγέω) is a compound of doulos (slave) and agō (to lead) — literally 'to lead as a slave.' Paul uses this term in 1 Corinthians 9:27: 'I strike a blow to my body and make it my slave [doulagōgeō].' The word appears only once in the New Testament (hapax legomenon).
Paul's use of doulagōgeō presents one of Scripture's most striking images of spiritual athleticism. He compares the Christian life to running a race and boxing — but unlike athletic competitions, the prize is eternal. He 'beats his body' not out of ascetic self-hatred but out of strategic self-mastery: lest, after preaching to others, I myself should be disqualified. True freedom is not freedom from all constraint — it is the freedom to say 'no' to the flesh in order to pursue what is eternally excellent.