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That's happened to me before, but while swimming. Had to practice capsizeing a canoe in rapids. Did, but the current took me. Took a lot of work to get back to shore. Didn't make it, had to be rescued (threw a rope out to me).

Most common reason for throwing up due to strenuous work out is your body overheats. In heavy uniforms and rooms with little circulation its quite common like in the case of greko-roman and some judo schools.

Another large reason is shock physical or mental. Like with many asthma suffers they freak out when they cant breath well and get real sick. Anemia causes nausia when working hard because the body isnt getting the oxygen it needs so first thing it does is rid the body of having to work digestive functions since digestion absorbs the most oxygen.

Now to my point^^ training hard is good. Training too hard is generally bad because your body is in constant trauma not recovery. But just cause some one gets sick some times doesnt mean they are stupid or doing something wrong. When the body feels threatened it lightens the load.

Personally i train no matter how i feel and i have been to classes while very hung over many times. So ya iv run outside in class used the bushes then go brush my teeth and continue. Usually durring kickboxing atleast 1 person a week looses it.

doing things in one breath?

to increase stamina/endurance..also gives you advantage where you can go longer because you don't lessen yourself by taking a breath [especially at a wrong time] -breathing can give your opponent an advantage. but if you can extend your control over it then you have the advantage.. well thats another topic if you'd like to start one about breathing..im not sure if its as important in in other martial arts but i would think so.

The human body can take A LOT more punishment via training than we give it credit for. It's funny, there were times in which I'd train for 1-2 hours very intensely and think, "Wow, I'm close to my limit..." But then like 2 months later I went to a 6 day long training seminar in Washington where the shortest of the 6 days was like, 8 hours, and on the first day we went for 13 hours, 4 hours before we went on a 10 minute water break. Hell, Mas Oyama, founder of Kyokushin karate, spent over a year living in solitude in the mountains training around 12-13 hours a day 6 days a week. Limits are the ones you set in your mind, at least I think so, anyway.

As for diet being the reason, I'll be the first to admit, my diet is completely and utterly horrible. I have like 2-3 whole pizzas every week, and I'm not exaturating at all, lol. So idk how much of that is diet, really. It could be a combination of things, bad food beforehand + stress + humid conditions + intense training + hairball + whatever else = vomit. Personally, I've never thrown up, gotten close, but never have, and it pisses me off, lol.

throwing up because you work too hard is a consistant problem at my dojo,
it all has to do with diet. I won't tell you how to eat, but I've found that whole wheats and heavy grains, as well as lean meat will give you energy, and help you build muscle.

Doing things in one breath builds up stamina, teaches you how to control yourself and your heart rate, which is important for people who can have heart problems.

Stress is also a reason for vomiting, so if you can help it, focus on your breathing and relax, it will keep your muscles from tensing and causing a gag reflex. For me, if I feel like I will vomit, and I am dry heaving, I put my hand to my mouth, because I have peppermint oil on my uniform sleeve. Peppermint oil is the scent that keeps me from gagging, if you can find yours, use it.

Otherwise, training that hard is a good thing, it means you're actually working to your full limit.