I joined a gym and couldn't do hardly anything and my instructor said when I stopped i'd feel so much fitter straight away. I didn't really feel it the first time I was there but I tell you it's got soooo much better. I can actually go on the treadmill, jogging, for more than 10 minutes! I couldn't even run for a bus before. It's so motivating knowing that the more time you#'ve been off the cigs the more fit you are - I'll be running marathons in no time!!!