1 Timothy 4:8 for while bodily training is of some value, godliness is of value in every way, as it holds promise for the present life and also for the life to come.
There is value in what ever God gives you to do if you do it as unto God and not for men.
When you gain respect among a group of people with similar interests and you exhibit behaviour that they find pleasing they are more likely to take you seriously when you explain what you believe and why.
Just like Tim Tebow's opinion holds weight to at least some collage football fans.
Fans love him or hate him.
However all will be silent when he speaks.
So who is God going to sent to the bodybuilding community?
1 Corinthians 9:20 To the Jews I became as a Jew, so that I might win Jews; to those who are under the Law, as under the Law though not being myself under the Law, so that I might win those who are under the Law;
1 Corinthians 9:21to those who are without law, as without law, though not being without the law of God but under the law of Christ, so that I might win those who are without law.…
1 Corinthians 9:22To the weak I became weak, that I might win the weak; I have become all things to all men, so that I may by all means save some.
