The man of the future may, and even must, do things impossible in the past and acquire new motor variations not given by heredity.
Man is largely a creature of habit, and many of his activities are more or less automatic reflexes from the stimuli of his environment.
Muscles are in a most intimate and peculiar sense the organs of the will.
Abundance and vigor of automatic movements are desirable, and even a considerable degree of restlessness is a good sign in young children.
Civilization is so hard on the body that some have called it a disease, despite the arts that keep puny bodies alive to a greater average age, and our greater protection from contagious and germ diseases.
Puberty for a girl is like floating down a broadening river into an open sea.