In this manner the grammatical and musical instruction developed the intellect of the boys, while gymnastic exercises were used to strengthen and train their bodies. Although these did not occupy quite so prominent a position at Athens as in the Dorian states, yet considerable time and attention were devoted to them, since the real aim of all pedagogic efforts was supposed to be the harmonious development of body and mind. It is not easy to determine at what age the gymnastic training began; what Plato and Aristotle say on the subject merely gives the pedagogic opinion of these philosophers, but does not refer to actual existing circumstances. Among modern scholars some assume that both musical and gymnastic instruction began with the seventh year, and that from that time onwards boys went every day to two distinct schools. Others suppose that gymnastic instruction came first, but that at first the exercises were easy ones, suited to the previous life of the child and tending to strengthen his body, and that afterwards the training in elementary subjects began. We have too little information to pronounce a definite opinion. The buildings in which the boys received their gymnastic training were not, as was formerly supposed, the gymnasia, but the wrestling schools (παλαῖστραι)--a name given to these establishments because wrestling and running were regarded as the most important exercises in elementary gymnastic training. No doubt other gymnastic exercises were practised at the wrestling school. Of course, many changes took place in the course of centuries till the time of the Roman Empire, and therefore it is but natural that very various opinions should prevail about the wrestling school and the gymnasium. The most probable theory is, that, at any rate at Athens in its best period, the instruction in gymnastics was given at the wrestling school, while the gymnasium was used for the further training and development of the youths. The wrestling school was not a public institute, but a private undertaking conducted by a teacher of gymnastics, who received a fee for the use of the building and the instruction given by him. These schools were under directors and managers (παιδοτρίβαι); the institutes usually bore their names, but they were sometimes called after the founder. Like other masters, they had a full disciplinary right over their pupils but they were also subject to the supervision of the inspectors mentioned above, whose duty it was to see that nothing which offended against morality took place in the gymnastic institutes, and also that the instruction was methodical and suited to the different ages. Besides these inspectors, no one else, except the paidagogoi who accompanied their charges, was allowed to be present at the instruction in the wrestling school; an ordinance of Solon’s forbade admission to grown men, but in later times this rule seems to have fallen into disuse.