Does such a thing exist? I worked out last night...probably one of the harder ones ive done in quite sometime and this morning i woke up and felt like ive been hit by a truck. Not really sick, just extremely lethargic and sore all over. Is it possible to over do it to the point you almost feel sick the next day? Also, there is a bug going around my office so maybe im just in the pre-stages of that, but this feels exercise induced if that makes any sense. I shredded my muscles last night so im taking advantage of the repair by getting a lot of protein today...and sleep.