Before my hubby leaves for work in the morning, I always tell him, "I'm going to yoga tonight" or "I'm going for a run after work." Once I've told him, I've committed in my mind to going. I know he's going to ask me how it was when I get home, and I don't want to say, "Oh, I ended up not doing it." So, tell somebody your exercise plans for the day--a spouse, coworker, or friend! And have them ask you about it!