Which of the following is a psychological benefit of exercising?

Exercising has numerous psychological benefits, and enhanced cognitive function is a prime example of how physical activity positively impacts mental health. Regular exercise has been shown to improve brain function by increasing blood flow, which transports oxygen and nutrients to the brain. This can lead to better memory, faster learning, and improved focus and concentration. Additionally, physical activity stimulates the release of neurotransmitters like endorphins and serotonin, which can improve mood and reduce feelings of anxiety and depression.

In contrast, the other options do not represent psychological benefits. An increase in body weight typically relates to physical changes rather than psychological impacts, and decreased muscle endurance primarily concerns physical conditioning rather than mental health. Similarly, lowered metabolism is a physiological aspect that does not directly pertain to psychological benefits of exercise.