I've just googled it and found a few good ones:
"The road to success is dotted with many tempting parking places"
"Obstacles are those things you see when you take your eyes off the goal"
"Habit is habit and not to be flung out of the window by any man, but coaxed downstairs a step at a time"
"You're not denying yourself pleasure, you're just changing what you find pleasurable"
Ellen Degeneres: You have to stay in shape. My grandmother, she started walking five miles a day when she was 60. She's 97 today and we don't know where the hell she is.