Most stock photos are cheery, super pretty photos. But there's a big market for these "negative" images... especially with a model release. Probably the only challenge I'd give something like this an 8.
The angle of this combined with the harsh shadows on the wall behind him and the black and white gives it a bit of a somber look that kind of makes me feel like this is a shot of a person on a morgue table, laying down instead of standing. This falls really flat to me.
I don't think this image has anything to do with the challenge. I am not voting on this image but if I did I would more than likely give it a 4 or lower. Reason being, I don't think you met the challenge's request to take an image of a stock photo of fitness.
Other than that I would see a doctor about the marks on your stomach.
Good lord!! The anti-fitness shot - there are two ways to take this and the best way is to laugh as most obese men are actually pretty jolly people. A very out of the norm image - clever.