Answer:
Physical activity, by nature, is a public and challenging venture. It requires participants to push themselves physically and mentally, to interact with others, to try new things, to probably trip, fall, sweat, and usually to look rather ugly!
All of this increases confidence by showing a person that he/she can do more than he/she thinks he/she can; that their body is an amazing tool; that people may laugh, but to laugh with them; to not take falls too seriously; to take on new challenges; to interact with different people; to set goals; to work to win; to learn how to lose and learn from a loss how to win next time; and to let others accept you for you, not for the make-up and stylish clothing.
Physical activity helps the body maintain a healthy weight, reducing weight anxiety, fear and self-consciousness.
Furthermore, physical activity causes the release of chemicals in the brain, called Endorphins, which increase overall internal happiness and reduce depression. Physical activity can make a person feel more positive about life.