When I saw the big Jesus on the t shirt of a guy at the gym I thought to myself: he must be one of those hardcore Christians than everybody in the US has grown to accept. Still had a slightly WTF feeling, but you cannot really question the beliefs of a hardcore Christian, can you?
After that I read the full message on the t shirt and understood that not only was he a Christian, he was also a bodybuilder. The t shirt read: Jesus is a bodybuilder. Adding Ephesians 4:11-16 underneath this should add some authenticity, not. Talking about weird things.
Here is the site where you can see all the Jesus gear to help you with your workout & shit:
http://www.discipletraininggear.com/disciple-training-gear-apparel
If you’re not already hooked by this one, surely the God is a power lifter one will get you hooked.
Related posts:

Do they have a T-shirt with “Jesus is a diet keeper” ?
I am pretty sure that true hardcore Christians can put together a diet related Jesus t shirt in no time.
For example:
http://www.bibleinsong.com/Promises/Temporal_blessings/Health/Health.htm
http://www.healthinspirationministry.com/bible_verses_on_health.htm