Every athlete

exercises discipline in every way.
They do it to win a perishable crown,
but we an imperishable one.

Thus I do not run aimlessly;
I do not fight as if I were shadowboxing.
No, I drive my body and train it,
for fear that, after having preached to others,
I myself should be disqualified.
1 Corinthians 9:25-27

(Lord Jesus, be merciful to me, a sinner.)