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Is it possible to workout so hard that you actually burn some muscle?
If you mean burn muscle as in lose muscle weight, then no.
The burning sensation during certain weight training exercises or high repetition training is caused by an accumulation of acid in the fatiguing muscle. The excessive acid acts upon nerve receptors producing the localized burning sensation. Excessive acid accumulation also impedes muscular contraction. Acid interacts with calcium, rendering it unavailable for muscular contraction. If repeated regularly, the muscle will begin to adapt to this stress to become more efficient for later bouts.
http://www.exrx.net/WeightTraining/PumpBurn.html
nooo you can only increase or decrease muscle. same for fat. it kills me when people say that you can turn fat into muscle.. well you need to be a wizzard to do that because you cant just turn an apple into a banana can you? nope nope nope,
yes you can, if you have a low bodyfat% your body will start eating away at your muscles for energy, but you dont have to worry about that
