How much is overtraining ??

Does anyone have there own definition of overtraining ? I hear how its no good to overtrain but what exactly is over training ? In some peoples mind its going 5 days a week or maybe jsut 3 and doing too many sets and reps ?? i guess everyone thinks differently but hopefully i can get a good understanding of what people think by hearing some replies.

i think alot of it depends on how much u eat

if you train a body part monday and the following week on monday you are not able to move the same amount of weight(or heavier) or do the same workout your over training

By definition overtraining is when you are unable to maintain a positive nitrogen balance (your muscles are getting smaller and weaker instead of growing and getting stronger). This can very drastically by how much sleep you get and how well you eat, as well as your age and whether you're using any gear. That's why it is so important to train instinctively, consume high quality food/supplements, and SLEEP.

Overtraining
Overtraining is a physical and mental collapse.
Why does it happen?
Overtraining occurs when a person experiences stress and physical trauma from exercise faster than her or his body can repair the damage.
What happens?
The overtrained individual suffers from prolonged fatigue and underperformance. There is no quantative test for overtraining, but the symptoms are:
Psychological
Fatigue
Reduced concentration
Apathy
Insomnia
Irritability
Depression
Performance
Decreased performance
Delayed recovery from training
Intolerance to training
Physiological
Elevated morning resting pulse rate
Increase in injuries
Chronic muscle soreness
Weight loss
Frequent minor infections
Appetite loss
Prevention and Treatment
Less is more!
Recommended Recovery Program
Five weeks of rest with low levels of exercise.
Correct nutrition.
Removing as much stress as possible.
Slow return to normal training levels.
Cross training to avoid temptation of too much too soon.

In general if performance and mood improve, the overtrained individual is recovering.

LOL thanks for the reply. There seems liek a lot of effects from overtraining.

I overtrained one time and I will never forget it. I went to the doc and thought i had the flu. He knew me pretty well and knews just what had happened. he sent me home with the order of bedrest for 4 days and minimal duty. Took tylenol. It sucked, and to think i did it to myself made it worse. You know how you feel when you can't go to the gym but when its your fault it makes it that much worse.