My motivation would be Just Do It. Don't go buy fancy equipment unless you're pretty sure that's the kind of exercise you'd like to do. It will likely gather dust. Go to Collagevideo.com (I hope it's ok to put that in), look over their selection -- they have short video clips so you can get an idea -- get some dvds from anyplace and just make yourself get moving. Your motivation is that you'll feel a lot better afterwards.

My weakness is letting the day get away from me, so I work out early in the morning. I hate forcing myself into my workout gear but feel so much better as soon as I get started. I do Billy Blanks or Amy Bento 10 Minute workouts strung together.

Do not listen to the voices in your head that say no; just act like a robot and make yourself stand in front of the tv and do it. (At least that's what I have to do.) It takes a little while, but soon it will become a habit. Good luck!