I think I should join a fitness centre . I am getting a little fat and I'm totally out of shape . Even a quick walk of a few hundred metres leaves me out of breath .   I'm afraid you are beginning to look a little overweight . You really need to stop smoking . That's the main reason you're unhealthy .   I guess you're right . I've tried stopping , but I just can't seem to quit .   Why don't you try smoking one cigarette less each day ? How many do you smoke each day now ? 