Sport is not only physically challenging，but it can also be mentally challenging.Criticism from coaches，parents，and other teammates，as well as pressure to win can create an extra amount of anxiety or stress for young athletes.Stress can be physical，emotional，or psychological（心理上的）and research has indicated that it can lead to burnout.Burnout has been described as dropping or stopping of an activity that was at one time enjoyable.
The early years of development are critical years for learning about oneself.The sport setting is one where valuable experiences can take place.Young athletes can，for example，learn how to cooperate with others，make friends，and gain other social skills that will be used throughout their lives.Coaches and parents should be aware，at all times，that their feedback to youngsters can greatly affect their children.Youngsters may take their parents’and coaches’criticisms to heart and find a flaw（缺陷）in themselves.
Coaches and parents should also be careful that youth sport participation does not become work for children.The outcome of the game should not be more important than the process of learning the sport and other life lessons.In today’s youth sport setting，young athletes may be worrying more about who will win instead of enjoying themselves and the sport.Following a game many parents and coaches focus on the outcome and find fault with youngsters’performances.Positive encouragement
should be provided without considering the outcome.Research indicates that positive reinforcement motivates（刺激）and has a greater effect on learning than criticism.Again，criticism can create high levels of stress，which can lead to burnout.

The author’s purpose in writing the passage is（）。