As children show considerable and important differences in their bodily responses to exercise, compared to adults, it is important that coaches are aware of the more important differences to avoid imposing undue physical stress on their young charges. Against this background the author discusses some anatomical and physiological aspects which must be considered when coaching children and adolescents. He arrives at the conclusion that the safest course for the coach is to plan shorter periods of activity than would be the case in on equivalent adult squad. In coaching situations there should be frequent short rests, with exercise periods of about 15 to 20 minutes. Especially pubescent girls who may be new to menstruation should receive sympathetic treatment in the sportslexercise situation.