First of all
40lbs gone forever, that's Great, you should be very proud of yourself. Eating healthy is the way to Go.
Now on to moving more:
Why not try to make exercise, the first thing you do in your day, like brushing your teeth or washing your face, it's a no brainer. Like anything new or differant it will take time to make it a "neccessary" part of your day. Hey, you might even look forward to it
Just don't try to over-do it at first. That will just make it worse, also try to find things that you enjoy. Now you did say you are eating healthy, it's just the exercise, well...you really answered your own challenge. You do know what you have to do....
Good Luck and let us know how you're doing, also there is an exercise thread, that some find helpful, maybe they want to try something new or what's working, or not for that matter.