Sports is not only physically challenging, but it
　　can also mentally challenging. Criticism(批评)from
　　coaches(trainers) , patents, and other teammates,
　　as wellaspressuretowincancreatetoomuch
　　anxiety or stress for young athletes. Stress can be
　　physical, emotional, or psychological, and research
　　has showed that it can lead to burnout, Burnout has
　　been described as dropping or quitting of an activity
　　that was at one time enjoyable.