Finally deciding that I no longer wanted to be skinny, or thin. I joined a gym to do completely do the opposite of what everyone was doing at that time. With only determination in my back pocket, I soon was introduced to bodybuilders, fitness models etc. My fate was sealed.
This soon became an obsession which quickly turned out to be my addiction.

It's both mental and physical for me. I like setting personal goals for myself knowing that I can push myself further than I thought was possible.
It's a healthy addiction.