Final answer:
Exercise reduces stress by reducing cortisol levels in the body and promoting the release of feel-good chemicals.
Step-by-step explanation:
The effect of exercise on stress is that it reduces stress by reducing the level of cortisol in the body. Exercise helps to regulate stress by promoting the release of endorphins, which are known as the body's natural feel-good chemicals. It also increases the production of neurotransmitters like serotonin and dopamine, which can improve mood and reduce feelings of stress and anxiety. Furthermore, exercise can help to distract from negative thoughts and promote relaxation.