Everyone seems to really know what they want! I think that is key! If you see yourself already there, already accomplishing what you want, you will do whatever it takes to get there!
Sure, there will be days when you don't feel like working out or days when you may eat a hot fudge sundae, but those are okay too! Just stay focused on the goal and I'm telling you, your brain will get set to automatic pilot. You will ultimately create positive habits and you will do these great things for your body out of a natural tendancy.
Heck, I don't give myself a reason not to exercise! If I make time to eat, I make time to exercise!! You know???