I started when I realised one day that my size 46-waist jeans were getting tights. Knowing that it was the biggest size that walmart carried, it was a huge reality check. I was scared that I would get so big that I wouldn't be able to find clothes that fit, and I also had just had pictures taken with my daughter, and realised exactly how big I had gotten.
I immediately started eating better and about 2 months into my weightloss journey, I started working out (I started walking right from the beginning though). I managed to really stay focused until Christmas, but since then I've really been unfocused and undisciplined. I'm personally going to kick my butt though, because I am over halfway there, and I've come too far to give up.
I look at pictures of me before, and then compare them to now -- that is my motivation to keep going. I have always disliked my body, and now I am starting to like it. I want to feel 100% confident when I go out, and more importantly, I want to like ME.