Answer : Injuries in those areas mostly occur because they are some of the main joints used daily for exercise and as said in the question sports.
Explanation:
I do not think that they should send notes home because BMI is not accurate for many teens and children. The BMI is not accurate for people involved in sports or people who worked out. This would not be affective, there are more effective if they found out their ways to detect childhood obesity. For these reasons I do not think that agencies would support using BMI but maybe something else
Warming up is important because you need to "warm up" your core and muscles and gets the blood flowing in preparation of a strenuous workout. It also helps prevent the risk of injury.
Stretching, walking, jogging, arm circles, lunges, squats and jumping jacks are good choices to include in a warm up
