sounds like you have identified a type of exercise that will suit you. Just make sure you set yourself a small goal you can achieve. This might be getting out for an hour walk 3 times per week. Then you can increase it gradually. Stick with that simple formula (slow increases of exercise you find suits you) and you're on to a winner!
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"