I guess when somebody offers you a movie, you don't say no. That's what I've learned.
I am really a very shy person. If I appear, it is because of the music, not because I want to be seen.
When you step on the treadmill, make a commitment. Do, say, 3 miles a day. And don't get off until you finish. It doesn't matter what speed you're going. Just don't get off.