In 1 Corinthians 9:26, Paul says he does not fight like someone beating what?

Answer: The air

Comparing the Christian life to athletes, Paul says, "I do not run aimlessly; I do not fight like I am beating the air."

“Therefore I do not run aimlessly; I do not fight like I am beating the air.”— 1 Corinthians 9:26 (BSB)