Identify one psychological benefit of regular exercise.

Regular exercise is well-documented to have numerous psychological benefits, one of which is the improvement of mood and a reduction in anxiety levels. Engaging in physical activity stimulates the release of endorphins, often referred to as "feel-good" hormones, which contribute to feelings of happiness and euphoria. Additionally, exercise can increase serotonin levels, a neurotransmitter tied to feelings of well-being and happiness.

Moreover, regular physical activity provides distractions from daily stressors, serving as a form of mental escape. This distraction can help mitigate symptoms of anxiety and stress, allowing individuals to cope more effectively with challenges. As people exercise, they also often experience a sense of accomplishment and improved self-esteem, which further enhances their overall mood.

In contrast, the other choices do not reflect widely recognized psychological effects of exercise. Increased aggression would not be considered a benefit of exercise; instead, studies have shown that regular physical activity can help manage anger and aggression effectively. Similarly, reduced motivation contradicts the tendency of exercise to elevate energy levels and instill a sense of drive. Lastly, enhanced feelings of isolation run counter to the benefits of community and social engagement that can come from exercise, particularly when it involves group activities or classes.