LittleGirl,
You'll never reach your highest point, because we allways keep adjusting and readjusting our goals, dreams, and desires.... So you will always have something better to look forward to!

And I really mean that, I'm not just saying it to be cute or whatever. I always thought that when I lost the fat in my legs, that would be all I wanted from this. Now that I can see the light at the end of the tunnel on that one, I find that I've readjusted my desires, because now I want to thicken up my arms and back more. I'm sure after that, there will be something else I want to modify.
This is gonna sound really egotistical, but umm.... I think one of my biggest motivations is: Damn, we push ourselves to limits that most people don't and it makes me feel like I'm part of a really special group. Not just one of the crowd. Not ordinary. Not lazy. Not run-of-the-mill. Dare I say.... it makes me feel "better than"? I realize that's politically incorrect, but secretly, I think I do feel that way to some extent.
Of course, I was picked on a lot as a kid, so I have a need for mental revenge on a bunch of people in my ninth grade class in oh-so-preppy Upper Arlington, Ohio!! (My mom sewed all my clothes, and I had no Izod sweaters, among other unforgivable transgressions.) This helps satisfy that secret urge...
It makes you realize that you can do anything you put your mind to. It's definitely helped my self-esteem at home, work, everywhere.
Also, it just plain makes you feel good! I think it may actually be addictive.
Arnold says in "Pumping Iron" that getting a good pump feels better than.... well, you know! (laugh)
Fennec