Thanks for your response and suggestion, Hamster-Bamster. I can't bike because I'm too obese and have emphysema. I have to wear oxygen at all times so everything's out for me besides walking. I weigh about 285 and am only 5'4. I was about 150lbs when I started on the risperdal which is why I wondered if anyone else had had a similar problem with it. I need to get some of the weight off because it's starting to take a toll on my joints, especially my knees which are arthritic.