This very interesting item consists of four 5 x 7 inch booklets and a box. Each booklet explains a certain gymnastic technique with a few pages of text and eight full page pictures on a fold-out chart with a nude woman performing this exercise. The author is Dora Menzler and this set was published (either in the late 1920s or early 1930s) by Dieck & Co. Sportverlag in Stuttgart, Germany. Some of the pages are a little lose but none are missing. A great early example of the German nudist movement.