The reason why people develops dark circles is the blood circulation of the body is obstructed due to fatigue, insufficient sleep and huge mental pressure. Under such circumstances, you should take sufficient rest and relax yourself in a good motion. And you can apply warm compresses over your eyes alternate with the cold compresses and do eye massage to reduce dark circles. In addition, appropriate amount of aerobic exercises does help get rid of dark circles under eyes because aerobic exercises can promote the blood circulation.
Yes, the exercise can help reduce your dark circles under eyes. As we know, the dark circles under eyes are mainly caused by the lack of good sleep and bad blood circulation. When you do the exercise, you will find that you will have the good blood circulation and your body becomes hot. The dark parts around the eyes will work actively. Then the dark circles under eyes will become released. You could do this to help you reduce the dark circles under eyes.
I am really sorry to hear that you have got dark circles under eyes. Because those dark circles would make you look very bad and make you less confident in public and your personal image would be damaged. Anyway, exercise would quicken your blood circulation, which would do good to your dark circles. But what matters more is to figure out what led to your dark circles and take actions against it.