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

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LEG ROTA- T I O N IN HANDS-AND- KNEES ATTI- TUDE ( End of Fifth Phase). The right leg is at maximum extension backwards and simultaneously raised as far as possible off the ground. In the illustration, the leg is shown in perspective. FILM 3. VERTICAL PELVIC ROTA- T I O N ON HANDS AND KNEES. " The M a c h i n e " Exercise (Fifth Phase). The pelvis is drawn back again to the level of the heels and the exercise begins anew from the first phase.