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 ON HANDS AND KNEES (End of Eighth Phase). The right leg is back in the original posi- tion. The exer- cise may now be repeated from the beginning. FILM 2. PELVIC ROTA- T I O N IN THE HANDS- AND-KNEES ATTITUDE [End of Fifth Phase). The pelvis has returned to its original posi- tion. The rotary movements begin anew. 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.