If you want to see serious improvements in your fitness level, you have to push your body to the limit – then do it again. The processes that makes your muscles feel sore also strengthens them and being winded trains your body to better conserve oxygen. Though pushing your physical boundaries is healthly, pushing them too far can be dangerous and debilitating. The key is to know when you're overdoing it.
Dr. Christopher Kaeding, professor of orthopedics at Ohio State University and head team physician for the Buckeyes offers some insight.
It should be pretty obvious that throwing up after or during exercise is not a desirable result. "I'm not saying that if you push yourself so hard you throw up, you've done damage," says Kaeding, "but I always think that's a pretty good sign you may want to reassess how hard you're pushing yourself." Getting nauseous or light-headed from your workout can indicate that you're dehydrated or experiencing heat exhaustion. Heat exhaustion can be treated with rest in a cool place but, if ignored, it can lead to heat stroke, which can cause brain damage, organ damage, and death.
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