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

In Exercise 4—" The Machine Movements "—on the other hand, the rhythmic relaxation of the pelvic floor should be passive only in the second starting position and in the fifth (5) phase. (Note text to film.) In the first and second phases, there should be conscious contraction, involving the levator : in the third and fourth phases, there follows an active release of tension : a most important link in the sequence of movements, as this active relaxation of the pelvic floor combined with a contraction of the abdominal muscles. And the complete and distinct control of these two sets of muscles may be of the utmost value in the final stages of birth. But, as this implies gymnastic skill—though no special muscular force—it is as well not to essay it until the " machine move- ments " have been fully mastered. Another exercise which involves alternate contraction and relaxation of the pelvic floor is No. 9, " Pelvic Flicking or Flipping in the Squatting or Kneel-heel Position." Its special utility is based on this rapid alternation. Those who have attained proficiency in Exercise 9 are able to increase its effect by concentrating their attention on the movement of the pelvic floor. And they may further specialise by concentrating this movement on the vagina. Thus, this movement of the pelvic floor is accompanied and accentuated by quick staccato movements of the vaginal muscles : a combination which is of particular value for the technique of coitus. Exercise 10, i.e., u Pelvic Lunging," can—and in advanced stages should—in its final phase be accompanied by active relaxation of the pelvic floor and especially of its vaginal portion; and as the pupil resumes the initial position, this changes to passive relaxation. It should be noted that active relaxation of the pelvic floor, especially of its vaginal portion, are the same as intentional dilation or expansion of these parts ; in Exercise 10 there is active dilation of the vaginal orifice. Exercise 20 achieves a capital muscular relaxation, especially in the pelvic floor, but the full benefit is only gained if this perineal action is obtained consciously. Exercise 21 offers an alternate tension and relaxation,