Hey, I've wondered about that too. I don't think your body actually smells, I think that your nose is going through so much crap that you just think you smell stale. Because sometimes, your nose will clear up but you'll still feel sick, but you won't smell that stale-ness anymore. But hey, I'm not a doctor(yet) so don't listen to me. lol
"I don't like it when my juice wears tights"--Dane Cook
Cardio Tip: If you can't have a conversation while doing your exercise, it's too intense.