Which of the following is a benefit of regular physical activity?

Regular physical activity contributes to improved mental well-being by releasing endorphins, often referred to as "feel-good" hormones. These hormones help to alleviate feelings of depression and anxiety, promoting a more positive mood. Engaging in physical activities can also reduce stress levels, boost self-esteem, and enhance overall cognitive function. Furthermore, regular exercise can improve sleep quality, which is closely tied to mental health.

The other options present outcomes that typically do not align with the benefits of physical activity; rather, they suggest negative effects that are counterproductive to the goals of maintaining a healthy lifestyle. Regular exercise is associated with lower stress levels and increased energy, along with better muscle tone.