Aristotle the great philosopher of all the times observed that "body is the temple of soul and to reach harmony of the body mind and spirit. The body must be robust."
The primitive man led a vigorous life for his survival in this world in valleys and hills. Because of these vigorous activities man developed a good physique.
Modern man is no longer required to lead a vigorous outdoor life in saving devices. Hence he is tempted to lead a sedentary life. Leading to a stage of physical degeneration and mental de-arrangement.