The only thing I'd add - working out is time-consuming, and getting started at a gym is both hard and intimidating. Gyms themselves are counting on you to stop going - that's how they make their money. If you're having trouble getting started, consider saving up your money and getting a personal trainer for a few months. The personal trainer will teach you how to use the equipment properly, get you more comfortable around the gym, and, most importantly, will be so godawful expensive you won't shrug it off and not bother to go to the sessions - the pain of wasting all that money will be too much.
Yes, I know this is silly - but I was getting chunkier and chunkier over the past couple of years and for me that was the only thing that worked. Personal willpower just wasn't getting it done.