And although our bodies are bounded with skin, and we can differentiate between outside and inside, they cannot exist except in a certain kind of natural environment.
The soul is something which contains the body. The body doesn't contain the soul. The soul, if we put it into modern language, is the entire complex of relationships in whose context this organism exists.
Physical education for the body to be effective must be rigorous and detailed, far sighted and methodological. This will be translated into habits. These habits should be controlled and disciplined, while remaining flexible enough to adapt themselves to circumstances and to the needs of growth and development of the being.