Staying Focused

So, here I am again. I just seem to be having a really hard time staying focused lately and I don't know why, and I don't know what I can do about it. How to regain lost motivation?

I got an email from a friend that really struck home for me although I know she didn't intend it that way. She remarked that we'd been friends for a year and a half now. While I think it's great that I've met some wonderful people during my journey, my mind finished the sentence with "... and you're not at goal yet."

Well, I'm not. I look like a normal person now, but I'm not where I'd like to be and my BMI is still overweight. So why have I been wasting all this time? I don't know.

The Biggest Loser has started up again and it's been giving me a little kick to start exercising again. I always feel so much better when I do so I don't know why I don't make a bigger effort.

So now I need your help! What are your strategies for getting back on plan when you've been derailed? I started this and I'm going to finish it- just need to figure out how!