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.
Decrease in Performance
If you're working out responsibly, you should see your performance improve or at least stay the same. If you notice your performance dropping or you feel especially exhausted by your usual workout, you might be overtraining. Kaeding says this is difficult to evaluate – some researchers are even trying to create blood tests for it – so the best thing to do for now when your performance dips is err on the side of caution and give yourself a break.
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