What keeps you moving?

Staying motivated to continue working out can be very difficult. Oftentimes, if I have something to look forward to, a vacation for example, it's easier to stay focused. Keeping focused when there's no time crunch or travel date is much harder. In fact, if I do not make mini-goals for myself, I find myself really easily unmotivated. Any excuse at all is suddenly acceptable.

When I joined the Mamavation sisterhood, I promised myself I would give up this time. I wish I could be one of those people who only workout sometimes, and yet they look great. I am NOT one of those people. I'm more of the must workout constantly to maintain variety. It is frustrating. Results come slowly, but they do come. And when I slack off, I am instantly punished with weight gain. I just have to work harder than some people, but being healthier is worth my time and toils. What are some ways you keep yourself motivated to work out?