The Equal Action of Both Legs.—The most important duty of the legs is to act together for the purpose of giving or sustaining impulsion. This action should command the forward movement and its acceleration. To obtain this result, the legs can act by simple pressure of the knees or by pressure of the knees and calves. The pressure of only the knees is sufficient with delicate horses, but with others the pressure of the calves has to be added to that of the knees. The more energetic the pressure and the farther behind the girths it is, the greater the result produced. Usually the action of the leg is strong enough if it is placed against or a little in rear of the girth. If the action there is not sufficient, it may be carried back a little—never, however, to reach an angle of 45 degrees. The perfection to aim at is to have the leg move almost imperceptibly and vary its effects only by different shades of pressure; but with a horse that does not respond sufficiently to the demands, it becomes necessary to carry the leg back a little by bending the knee and keeping the heels low. The inclination of the leg to an angle of 45 degrees is the very maximum, which it is unscientific and useless to pass or even to reach, so that if the action of the leg is not efficacious under these conditions, we must turn to more energetic methods. But little trouble is experienced in teaching riders not to carry the legs too far back. The reverse is usually the case.
The above method failing, the next to try is consecutive thumpings with the calf of the leg, not very pronounced, but repeated until the result sought is obtained. At the instant the legs should cease their action, and should repeat it only when the need again is felt.
If this means is not sufficient, there is nothing to do but come to blows with the legs. These are executed by slightly carrying to one side the calf and ramming it against the horse with a violence proportionate to the result to be obtained. This movement ought to be done without raising the knees or sticking them out, the lower part of the legs being independent of the rest of the body in order that the seat and the hand be not deranged. This manner of getting action upon the horse ought not to be continued for a long time, even if its effect is not sufficient or lasting. Like every violent movement, this one ought to be exceptional, and rather than repeat it frequently, it is better to have recourse to short, energetic action of the spurs.
It is very necessary to avoid the frequent fault of using the leg after sufficient action has been gotten out of the horse or of continuing the demands when they are already obeyed. Then the impulsion of the horse is augmented in a manner prejudicial to the desired result, which necessitates the action of the hand to oppose the augmented impulsion falsely ordered by the legs.
Unequal Action of the Legs.—When one leg is used more than the other, the haunches are displaced to the opposite side. The horse is then said “to range his haunches.” This effect is often useful in preventing the horse from slipping out sideways, in straightening him, and in making him change directions, etc.; but its greatest utility lies in permitting the rider to range the haunches and traverse the horse, which movements are essential to the main instruction in the mental and physical suppling of the horse.
The rules for the use of both legs apply equally well to the use of one leg, as regards place of contact and manner of graduating the intensity of action. (“Equal Action of Both Legs and Unequal Action of the Leg,” from “Elementary Equitation,” by De Saint-Phalle.)
To Bring the Hind Legs Forward Under the Horse.—Due to contraction of the muscles produced by the tickling sensation of the leg or spur upon the side, the horse mechanically brings his hind legs up under the body when so forced. This bringing up of the hind legs places the control of the movement of the mass in their power, because the center of gravity is nearer their base. Hence the leg movements become more elevated, the speed less fast, and the horse more handy and more easily controlled.
Mutual Support by the Legs.—If one leg acts to range the haunches, the other should receive the mass to limit and control the movement. Both legs should be at all times close enough to the horse to act accurately, quickly, and without abruptness in order to assist each other.
When a Horse Is “Behind the Legs.”—When a horse refuses to move forward after the equal action of both legs is produced, he is said to be “behind the bit” and likewise “behind the legs.” A horse in this state is beyond the control of the rider, and every means should be exerted to force the horse with the legs up into the bit again.
The Spur.—The spur should not be used until the seat is secure. If the pressure of the calves of the legs is sufficient to command impulsion, the spur should not be resorted to.