Taking part in physical activity has numerous benefits, including enjoyment, development of friendships, and helping individuals feel good. However, a physical challenge is not considered a benefit of physical activity. While physical challenges can be a part of physical activity, they are not the primary reason for engaging in it. The main benefits of physical activity are related to mental and physical well-being, such as enjoyment, social connections, and improved mood. Therefore, "For a physical challenge" and "Development of friendships" are the two options that do not represent benefits of physical activity.