ABSTRACT
Regular training of children and adolescents is becoming more common in sport, and competitive sports are indulged in with ever-increasing intensity at ever-decreasing ages. In certain sports, such as figure skating, swimming and gymnastics, children start regular training when they are 5-6 years old, and even in contact sports, such as soccer, training and competition they are beginning to train at earlier ages. In certain sports training for 2-4 hours, 5 or 6 days a week, is not unusual.
