How NOT to End Your Run
Do not finish a distance run by sprinting to the end. This can be counter-productive to your training. You could be doing your body real harm.
When you suddenly stop a strenuous exercise, blood tends to pool in your legs. This puts strain on your cardiovascular system as it tries to maintain your blood pressure level. Dizziness, light-headedness and fainting can result.
The better approach: At the end of your run, cool down gradually, from a run to a jog and then to a walk. It is best to walk a while after a run to cool down and let your heart return to a normal pace gradually.