Exercise! Sounds great in theory.
Steven Aitchison has 6 Easy Tips to make exercise a habit.
For me it's about finding the time. What is your challenge?
Steve suggest, among others:
Choose Things You Like Doing - Makes sense! If you don't like jogging, don't pick that. I love the elliptical and free weights. That's where I'd go.
Track Progress - Absolutely! And free apps make it so easy. And if you're counting calories on an app, it make you extra to burn ;)