You are making some excellent choices to preserve and protect your health for the long term! You are completely correct that losing weight and staying in a healthy weight range is an important part of making sure you don't develop cardiac disease or stroke.
It is important to discuss this concern with your doctor
. The key to healthy weight loss
and heart healthy activity is consistent aerobic activity--something that gets your heart rate up and keeps it up for at least 30 minutes several times a week. However, this does *not* have to be running! Fast walking can be just as effective for weight loss and cardiac health, and if you do not have a background as a runner and are dealing with being overweight at present, vigorous walking or cycling might be more effective because you are less likely to develop an injury compared to running.
If you have been talking with your doctor about this, the best thing to do would be to discuss healthy weight loss/activity strategies at your next visit. He or she may even be able to refer you to a physical therapist
or personal trainer who can help recommend healthy ways to get in shape without getting injured. Good luck and this is truly one of the best things you can do for yourself.