Some people need to exercise for health reasons, most people should in order to keep in shape so there aren't health risks later in life. Some people it becomes a drug and they exercise too much, but how much is too much?

Unless you are a doctor, coach, or trainer, we're pretty much left out in the cold as to how much exercise we really need. I've heard you have to be in motion a half hour a day. That includes walking and any other kind of light exercise. We exercise loose a few pounds, and soon are exercising more. It can become addictive. It can also cause health problems.

According to about.com there are symptoms of exercising too much and dangers when you do. When you are starting a program, especially if you haven't been on one, get the help of a professional.