30 minutes a day will keep the doctor away

30 minutes of moderate exercise per day you can help you:
• Reduce heart attack and heart disease.
• Reduce risk of stroke.
• maintain a healthy body weight.
• Lower blood cholesterol levels.
• Lower the risk having 2 types of diabetes.
• Reduce the risk of cancers, including colon cancer.
• Lower feelings of stress, anxiety and depression

So, for a healthy body and mind you have no option but to exercise.
For starters it is best to start with a slow jog or a brisk walk, for at least 20 minutes. The jog should feel challenging, but comfortable. If you have, short of breath, relax for a minute or two, when you regain your breath you should be able to continue.

If you still have, shortness of breath or you are still concerned, consult your doctor.