I'm going to say that like every person who is overweight or obese, the reason I got started was because I was simply not happy with my appearance. Of course, this doesn't motivate someone to start by itself, otherwise there wouldn't be but a hand full of obese people. The second reason I got started was because I went to a health clinic at my work and had my stats taken, I was appalled about my health situation and knew that it was either change it or die young. I had made attempts before to loose weight, gain muscle, and become healthy, but this is the first honest to God effort I've made to accomplish this feat.
I love working out, it's very addicting.
I think one of the reasons I like it so much is that it's all me. I don't have a workout partner, so when I go to the gym, I am the only one who pushes myself to do something. I like the peace it brings, I get time to think, I get time to discover what I am capable of and what I am capable of becoming, and it relaxes me. Yes, when you're not in shape, it's a pain in the ass, it hurts, and you always feel inadequate when you look at someone who's been at the gym for a year or two, but I love working out because I know that I can push through the pain and turn myself into something amazing.