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 5.
SQUATTING
OR CROUCH-
ING SWING
(Second Phase).
The pelvis has
reached its
maximum point
direct above the
heels. Note the
distance between
the buttocks and
the heels.