Before revision: External links Natural Training (Official website of Georges Hébert association) Website for "Méthode Naturelle"(MN) group in Germany; the website is in English, German, and Russian 52-page pamphlet with extensive illustrations about how to set up an example of an obstacle course according to the principles of the Natural Method Article with history and photographs of Hébert's "Natural Method" Georges Hébert (website in French; contains links to photographs) Parkourpedia (Australia): "Hébertism - Méthode Naturelle - Principles" Hébert's "Practical Guide to Physical Education," 2nd edition.
After revision: External links Natural Training (Official website of Georges Hébert association) Website for "Méthode Naturelle"(MN) group in Germany; the website is in English, German, and Russian 52-page pamphlet with extensive illustrations about how to set up an example of an obstacle course according to the principles of the Natural Method Article with history and photographs of Hébert's "Natural Method" Georges Hébert (website in French; contains links to photographs) Hébert's "Practical Guide to Physical Education," 2nd edition.