Er... okay...
His chest can be muscular, but... the placing of the neck and shoulder makes the chest look out of place, rather than that, which I think you were going for...
Then he kinda looks like he's stretching because of the way his right leg sticks out, behind him, in contrast to his left, in front.
I would guess he's supposed to be kneeling... or something like that, maybe... but it looks too... close to the ground and straight.
I'd doubt he was trying to do that, because the stretch in itself is somewhat unnatural for choice positions. Not too hard, perhaps, but I don't think anyone would naturally choose it for preference in the apparent situation. You could try it and find out, if you were bored enough.
Was that too much?...
The last one I might've gotten carried away with... ... ...