Final answer:
During exercise, the normal response in the legs is increased blood flow, while an abnormal response would be decreased blood flow.
Step-by-step explanation:
During exercise, the response in the legs can vary. The normal response is increased flow after exercise. This means that blood flow to the legs increases during and after exercise. This is because the muscles in the legs need more oxygen and nutrients during exercise, so the blood vessels in the legs dilate to increase the blood flow.
On the other hand, an abnormal response would be decreased flow after exercise. This could be due to a blockage or narrowing of the blood vessels in the legs, which restricts blood flow. In this case, the blood flow to the legs would be reduced after exercise instead of increasing as it should.