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

319/426

(debug: view other mode)

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.