Obviousely its from fatigue and pushing yourself, but im just curious as to the medical/technical reasons for it, and whether it is right to push yourself to vomiting on a regular basis, is it good/bad for you? I feel the vomit rising nearly every time i do 3 miles+ or circuit training, i always slow down during circuit training as vomiting up in the middle of a sports hall full of 50+ people would probobly pish the bloke who runs it off. And unless im really going for it i usually slow down when running on my own, basically because its not pleasant and i dont currently see any benefits of going that far. However - if there are benefits i would be more likely to push myself to it. Does it increase cardio at all or increase endurance? Or is vomiting not looked down upon in the army simply because it shows you are pushing yourself? Im still a civvy so im just speaking from what ive heard, please correct me if im talkin nonsense please.