Because children and adolescents are not just miniature adults, it is important to know that children might be vulnerable to injury and may not respond positively to certain types or intensities of training. It is also important to recognize how training can positively affect growth and development, so it can be judiciously applied at critical times of growth when young athletes can enjoy optimal benefits. The purpose of this article is to inform readers of important pediatric exercise physiological differences so that they are more aware of the potential benefits and the potential hazards of exercise and to make practical and useful recommendations for teachers and coaches. Although not all considerations for exercise training and children have been described, safety should always be addressed. More research is needed as there is still much to be learned about children and exercise. Leaving the training session "wanting more" is good psychology and good physiology. (Contains 6 resources.)