Sex efficiency through exercises : special physical culture for women / by Th. H. van de Velde ; [photos, by E. Steinemann].
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The image contains the following text:
PELVIC
MOTION,
BACKWARDS
AND FOR-
WARDS, IN
THE KNEE-
HEEL POSI-
TION, WITH
KNEES APART
[Fourth Phase).
The trunk is now
from knee to
shoulder com-
pletely stretched.