Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].

294/426

(debug: view other mode)

The image contains the following text:

LEG ROTA- T I O N ON HANDS AND KNEES (End of Fourth Phase). The left leg is back in the original posture —h a n d s and knees. FILM 3. VERTICAL PELVIC ROTA- T I O N ON HANDS AND KNEES. " The Machine" Exercise (Fourth Phase). The lumbar vertebrae have reached their maximum arch upwards and the abdomen its extreme tension.