How do people become "gym rats"?

You know them. The people who go to the gym 6-7 days a week for at least 2-4 hours each day, sometimes twice a day. I could never imagine being able to dedicate that much time or effort to the gym! In fact, I hate the gym and I wish I could get the motivation to sign-up and go again, but I always end up quitting before my trial is even up. This is NOT something I'm proud of and I come to you with this question:

How do people become addicted to the gym?

How do people become "gym rats"?
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