Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
297/426

- (canvas 298)

The image contains the following text:

SQUATTING OR CROUCH- ING SWING {Fourth Phase). The pelvis touches the floor. FILM 6. PELVIC MOTION, BACKWARDS AND FOR- WARDS, IN THE KNEE- HEEL POSI- TION, WITH KNEESAPART (Sixth Phase). The lumbar ver- tebra? are arched outwards and the abdominal muscles drawn tense.