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:
FILM 11.
PELVIC VER-
SION WHILE
WALKING
(Twelfth Phase).
The left leg steps
forward. The
exercise has now
reached its first
phase and begins
again anew.