‘Gymnastik mit Sportgerat’ (Gymnastics with sport equipment) by HANS SUREN (1885 – 1972), a German officer, author and champion of Naturism. Published 1925, Dieck & Co. Stuttgart. Seven instructional booklets in a slipcase, six of them are accordion fold-outs (leporellos), 6 x 4 in., heavily illustrated with b/w photographs showing various techniques of gymnastics with sport equipment. Suren’s teachings were part of the developing movement of Naturism and Racial Hygiene in Germany in the 1920’s and 30’s, which included exercising alone or groups while being naked and one with nature. In 1942 Suren was accused of masturbation in public and expelled from the NSDAP and was imprisoned until the end of the Nazi regime. The slipcase features a cover illustration by noted artist LUDWIG HOLWEIN. Very good.