I don't know about you, but I've become a bit of an exercise nut since losing the weight. Not only is it an important element of keeping the weight off, it's really become a highlight of my day (and yes, I really do exercise every day!). It's part of my day that's just for me, where I can escape the daily grind of work and the everyday stresses of home life. Depending on the kind of exercise, I can let my mind wander or make myself focus 100% on my physical movement.
That being said, any routine gets to be a little boring after a while. If you're feeling the exercise blahs, don't let it sap your enthusiasm. Try something new.
How many of the following have you tried?
-Yoga and Pilates
-Distance running. Maybe a marathon is the new goal you've been searching for?
-Pole dancing. Yes, really. A lot of exercise clubs are starting to offer classes!
-Joining a softball or other sports team
-Skiing or snowboarding
Give something new a shot, and you'll find that you're back to your high-energy self in no time.