Because I exercise every day, no ifs, ands, or buts.
Because it's several hours during which I won't be eating (I stop eating one to two hours before I hit the gym, then no eating while I'm at the gym).
Because it's time that I have to myself, during which no one can make any demands of me and I am doing something just for myself.
Because I have such cool songs on my iPod and the only time I get to listen to them is when I work out.
Because I get to sit in the dry sauna for ten minutes when I'm done. It's so nice to be warm.
Because I had to eat off-plan for lunch; I know that exercising after eating off-plan always helps me get back on plan and it wouldn't hurt to burn a few extra calories.
Because I like the way all my muscles look.
Because I like the way I feel about myself when I've completed my workout for the day.
thinpossible, you've got to give it more than six weeks. Exercise will absolutely change your body, but it's a slow process; it takes a while to see results. What really helped me in the beginning was to set a long-term goal for myself. I decided that I would stick with my program for four months, whether it was working or not. If after four months, it wasn't working, then I would try something different. You also haven't mentioned whether or not you've made any changes to your diet, but doing so would help you see results sooner.
It also sneaks up on you. You plod along at your workouts every day and it doesn't feel like they are getting any easier or you are making progress. But then one day you are out walking with your friends and you suddenly realize they can't keep you with you anymore. Or you are at the gym and you realize you are doing something easily that killed you when you first started. Or you finally go for your annual check-up and all your tests come back way better than last time.
One reason I WILL exercise today!
Not only do I not like it, I don't feel like it's doing any good. Well, needless to say I'm not going to get very far with that attitude. I want to be COMMITTED to exercising regularly. I really want that. So I need an attitude adjustment. 
I believe it has a lot to do with the way you think. Bad attitude makes it really hard to do it. Im glad you know what the problem is and want to change that. So here is to us!! Positive attitudes!! 
It's funny that you mention progress measures. Just this morning, I tried the elliptical machine for the first time in about 5 years and wow, it was so hard. I could only do 2 minutes, stopping in between the minutes. I plan on using that as a progress measure.
