Celticmusl saidThere is a great majority of people that would suggest constantly working on your body would be the epitome of selfish self centered narcissism.
When people say that to me, they generally try to invoke religion and say it's not being modest, and that God doesn't approve of such nonsense.
Although I'm agnostic, I invoke religion right back on them:
"Do you not know that your body is a temple of the Holy Spirit who is in you, whom you have from God, and you are not your own? For you were bought at a price; therefore glorify God in your body and in your spirit, which are God’s (1 Cor. 6:19,20 NKJ)."
If religion is true, it would seem to me that God wants us to workout, eat right, and take care of our bodies.