Among other things that are essential after birth, a little child should be given nutriments in such a way that its tender little body not be harmed. The reason is that the heat, beset by its contrary, activates its efficacy with greater force, and is not left to languish from idleness. Weeping also activates heat to a great extent.
Exercise is required for the body.
All those games that do not render the body inept for the exercise of virtue will be of this type. This is the extent to which the legislator can contribute to the well-being of the body by establishing obligatory customs.