What I have found that has helped in the past and I've started to re-do it now.
Keep a diary that you write in everyday.For example, with my fitness program, I write daily in it about:
- the exercise I did that day (where I ran, how far, how did I feel etc)
- the after affects of the day before (am I sore, am I tired, do I feel great etc)
- inspirations or ideas I get (how to change the fitness program for the better)
- stick in magazine articles and tips (eating for energy, running tips etc)
- conversations about my fitness work and so on (talking to my brother about running and him saying he will start running me when he gets back from New Zealand in 3 weeks)
Then to keep myself motivated, I read back through my goals and journal each morning if I don't feel up to doing the exercise. If I can't do it for some reason (like my calves are currently very tender), I write how I feel in it and why I'm not doing it.
Although some people will keep it on their computer, although I update mine here regularly, I write it all down in a book that I bought. The book I bought really stood out to me when I was looking for an exercise book for about $1, but I ended up buying a cute one that is an actual journal for $9.95. Even though I paid more for it, I'm actually writing a stack more in it then I would if it was just a boring exercise book.