LOL, I don't think I've ever prayed for bigger muscles, just that I don't kill myself in the gym!
I read an article in M&F by Rick Wayne years ago, though. He said he had interviewed a champion bodybuilder back in the 1960's or 70's (he didn't say who) and he asked this guy his secret for getting big.
So the guy says that after every workout he drinks a gallon of water. "Okay, fair enough" Rick thinks to himself. Then the guy says, "and then I pray to the Lord to direct the ingested water to the muscles I have just trained to make them grow."
I swear it's true, I'm not making it up!