In my opinion, it is good for teenagers to take part in a group activity. They are playing a team sport or joining a hobby group or even a volunteer. Certainly these group activities will usually be done outdoors so it will be of great help to teenagers. First, they will be mobilized, exercise and exercise, ... Secondly, when participating in these activities they will increase solidarity. Finally, friendships are important to teens. They will be friends with people who share their interests. For these reasons, I think group activities are best for teens.