It is, however, one of the axioms of equitation that any effect of rider on horse loses its influence more and more the longer it is continued. If, then, bits or calves or spurs are employed continuously, without relaxation, the horse in time accepts the contact, becomes wonted to it, and all the effect disappears.
It is, therefore, necessary, from time to time, to "render the legs" in the same way that one renders the hand. Otherwise the sensibility to the pressure of the legs will wear away, or the hind hand will become fatigued and the horse refuse. But since the effect of the legs is less natural to the horse and less obvious to the rider than the effect of the hands, even more care must be taken to employ this effect with proper moderation. Moreover, if after obtaining motion forward by means of the contact of the legs, the rider continues to maintain the same contact as before, the horse will soon fail to understand the meaning of the first pressure. Relaxation of the contact is absolutely essential for conveying the meaning of the contact.
There are, however, two different ways of rendering the legs. Suppose that, to urge the horse forward, the rider needs three degrees of pressure. He exerts these three degrees, and the horse goes forward. The required speed being obtained, the legs then return to their normal one degree of contact, and the horse continues the movement for himself. This principle applies to all gaits and speeds.
