What are 3 ways physical activities can improve appearance

A gym session or brisk walk can help. Physical activity stimulates various brain chemicals that may leave you feeling happier, more relaxed and less anxious. You may also feel better about your appearance and yourself when you exercise regularly, which can boost your confidence and improve your self-esteem

Yes, this is very true. specifically causing damage in the  dentrite. 

Answer the lack of variation in activity can lead to boredom and eventually cause exercise to stop;