The bright spots in your eyes after your exercising, it is normal, and nothing serious. You have no need to worry about it. There have some different reasons for this kind of symptom. Hungry, fatigue and simulation of spirit will lead to this kind of symptom. The basically reason is the congestion of your brain's blood supplement. Then the retina in your eye ground has lack of blood circulation at a time. There have some nerve cells in your brain to delivery the visual signals. The messages which pass on by them will translated in some specific thing we know such as birds, tree etc. If the hard exercising shakes your head and brain, these nerve cells tremble, and then misunderstand the message into tiny pieces such as star and light. When the cough is healed, the symptom will disappear. No worries! You may need some water and nutrients to supply your blood circulation, relax and have a rest, it will recovery soon. Unless the symptom will last for a long time, you have no need to worry about it.