Some people think that there are such things as positive addictions that are actually good for you, and exercise is often considered one of them. Like sunnyday said, many people find that developing a "positive addiction" like exercise helps them stay away from negative addictions. But an exercise addiction can become a problem for some people. Exercising too much is hard on your body and can cause injuries and extreme weight loss. If you're truly addicted to exercise, you'll keep going even if you're injured--basically, you ignore the fact that your body's telling you to stop. You might also ignore other important things that need to be done or people that you care about in order to exercise. So even a healthy activity can reach a point where engaging in it is unhealthy.
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