When I was in college, I went to the personal counseling office because I was feeling really overwhelmed, and my counselor told me something about procrastination that will always stick with me: "Don't wait until you "feel like" doing something, because chances are good you'll never "feel like" doin...
I buy special, extra fresh-smelling body wash that I am only allowed to use after a workout. It's a great daily reward and feels sooooooooooooo great!
If you haven't already, you have to try interval training for your cardio. It makes the time fly, burns more calories, and gets you in better shape. Try one minute of intense activity followed by 2 minutes of recovery for 30 minutes.
I took my diet pop intake way down by chasing each bottle with an equal amount of water. Soon I was reaching for just the water.