You mean to tell me fresh from deployment he shed all that weight and he was still active??
If he was support and attached to a SF unit then yeah I can see that.
The physical demand to be SF is strenious, you have to be at a certain level of peak condition (Army wise) to be a member of that branch of SF. I'm expecting him to be a lot bigger like a real SF, not more streamline then his character is being portrayed.
I get it that he has to maintain weight and muscle but it's a fictional tv show lets roll with it... if we wanted realism we could just watch the "6" show Jack Bauer was Delta.... he didnt even look like it though...