My health is my motivator - I have type 2 diabetes, and exercise improves lots of the issues associated with that, independently of weight loss. I was also starting to get less and less mobile, and wanted to stave off the mobility scooter!
I started going to the gym in January - I committed to 3x per week as I felt that was an achievable level I could maintain. The first couple of months I had to use various psychological tricks to get myself there when I didn't feel like it. I had been reading a book about willpower and how habits are made and changed, and I used what was in there to help me.
Then a few months in, I started to enjoy it for its own sake. I enjoy the feeling of strength in my body, the sense of achievement - and it helps me relax as well. So now, exercise is "me time", which is great, because it means it's not an effort to do it, even though I can work quite hard when I'm there. The past couple of months I've added running once a week (well, mostly walking - building up gradually). We had our main holiday in the Lake District a few weeks ago, and did walks I would not have been capable of six months ago.
So what keeps me going.....
1) I enjoy the feeling of wellbeing and achievement.
2) Diabetes much better controlled, and also medication levels reduced
3) much more mobile and energetic, with less stiffness and joint pain
4). Gone from being a big amorphous blob to a large woman-shaped person!
OK, so it's impossible to say how much of these changes is due directly to the exercise and how much just to the weight loss. But I probably wouldn't have lost so much weight without the exercise, so it's a moot point.
Barbara