A、The lungs. B、The heart. C、The circulation. D、All of the above. D

The act of jogging doesn’t require any special skill. You do need to be basically healthy, (and, if you are in any doubt, you should consult your doctor) but then, after a few basic warm up bends and stretches, you are ready to begin. You simply start running, gently, and then build up to a steady pace. You then maintain that pace over your chosen distance. Jogging is not sprinting. So do not over tire yourself by trying to go too fast. A steady, comfortable pace is your aim.  Don’t overdo things.
    Jogging is excellent for keeping fit. It’s good for the lungs, the heart and the circulation. It’s easy and it’s convenient. Why don’t you try it? If you require more information, talk to one of the instructors at the sports center, We’re only too happy to help. Please remember: if you do decide to jog, talk to your doctor first if you have any health worries. And, ladies, do not jog alone in quiet places, especially after dark.