Riding The Horse - by Ms Lee B:
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The height is by trial and error. It must be high enough to ensure that at least one barefooted heel is off the ground at all times. (If you require the man to wear 5" high spikey heels, as I sometimes do, then both heel points can rest on the ground. The pressure on his feet and calves should be enough to soon get him squirming. I add blocks of wood under the saw horse to make up the additional needed height). I believe that it is best if the "rider's" feet are about shoulder width apart. Our horse has rails near the bottom for this purpose, and to use as a tie point for the ankles. An ankle spreader would work just as well. Fasten his hands behind his back or in the front to his collar项圈 — a band worn around the neck, or to a ceiling rope. Either way, you must ensure that he cannot use his hands or arm strength to relieve any of the pressure from the cross beam. It is that pressure, and the eventual need to shift it from one contact point to another, that will do the work.
The "horse" may not seem like it is doing anything at all for the first many minutes. But just give it time. He should be going clipity-clopity within an hour or so. Your experience may vary. A blindfold眼罩 — a cover for the eyes will also "enhance" his experience.