Every Christian who trains seriously runs into this question sooner or later, usually somewhere around the second year.
You are in better shape than you have ever been. You catch yourself checking the mirror more than you used to. And a thought arrives that is hard to shake: is this vanity? Should I care this much about something that is going in the ground anyway?
It is a fair question, and it deserves a better answer than the one usually given.
The verse everybody quotes
“What? know ye not that your body is the temple of the Holy Ghost which is in you, which ye have of God, and ye are not your own? For ye are bought with a price: therefore glorify God in your body, and in your spirit, which are God’s.” — 1 Corinthians 6:19–20
This gets pulled out constantly to justify going to the gym. And it does justify it — but not for the reason most people think, and it is worth knowing what Paul was actually addressing.
What Paul was really talking about
Read the chapter around it. Paul is not writing about fitness. He is writing to the church at Corinth about sexual immorality, and his argument is that what you do with your body is not a spiritually neutral act, because your body is not private property.
That is the actual claim: you are not your own.
So anyone using this verse to say “God wants me jacked” is stretching it. But anybody using it to say your physical body is spiritually irrelevant is contradicting it outright. Paul is saying the opposite of irrelevant. He is saying it is holy ground.
So where is the line?
Here is the cleanest test I know, and it is not about how much you train or how you look.
Stewardship asks: what is this body for?
Vanity asks: what does this body get me?
Same squat. Same five mornings a week. Completely different thing underneath.
Stewardship trains so he can carry his own kids at fifty, so he is useful in an emergency, so he is not a burden at seventy, so the years he was given are not wasted through neglect. Vanity trains to be looked at.
The hard part is that you can start in one and drift into the other without noticing. Most of us run both at once, in a ratio that moves week to week.
Three honest diagnostics
1. How do you handle missing a session? Stewardship is disappointed. Vanity panics. If one missed day makes you feel like you are disappearing, the training has started carrying something it was not built to carry.
2. What happens when nobody sees it? If a session off-camera, with nobody to tell, feels pointless — that is worth praying about.
3. What does it cost the people around you? This is the sharpest one. If training is quietly taking from your wife, your kids, your church, your sleep — the body might be getting stewarded while everything it was supposed to serve gets starved.
The part nobody says out loud
Scripture is not squeamish about physical strength. Samson, David, the soldiers of 1 Chronicles, the athletic language Paul reaches for again and again. Strength is treated as real and often as good.
But it is never treated as the point. “For bodily exercise profiteth little: but godliness is profitable unto all things” — 1 Timothy 4:8. Read it carefully: Paul says bodily exercise profits little. Not nothing. Little. He is ranking two goods, not condemning one.
That is the posture to aim for. Train hard. Hold it loosely. Know exactly where it sits in the order of things.
A practical landing
If you are asking the vanity question at all, that is usually a decent sign. Genuinely vain people are not troubled by it.
Keep training. Keep the body useful. And once in a while, in the car on the way in, ask who this is actually for. If the honest answer is drifting, you will know — and the fix is almost never to stop training. It is to put something heavier than the barbell back at the centre.
We make a 1 Corinthians 6:19 tee for people who treat training as stewardship rather than vanity. Printed to order in the USA.