At the age of 15, sons of commoners would be sent to a Telpochcalli within their neighborhood. Here, boys would be trained in the art of warfare and accustomed to military life. The instructors at these schools were veteran warriors who had experience in warfare and leadership. The schools focused on bravery and included a great deal of physical effort and intense pain to increase the strength and stamina of the students. Manual labor included transporting goods such as branches for firewood. The longer the student had attended the school, the more branches he would be expected to carry. This test of carrying firewood would be used to determine if the boy would do well in warfare.