The half-pass is usually taught after the haunches-in is well confirmed. It may first be introduced by riding a half-10-meter circle from the long side to the centerline, or a half-volte, and then half-passing in. The circle naturally places the horse's body in the correct bend, and helps to encourage the engagement needed for the movement. The outside hind leg must step well under the horse's body to push the animal forward and sideways. A rider uses an active outside leg slightly behind the neutral position to ask the horse to step forward and under. The outside rein maintains the correct bend and contains the energy of the horse, the inside leg keeps the horse moving forward, and the inside rein guides the forehand in the direction of movement. The rider also uses his or her inside seat bone to help maintain bend. If the rider is off-center or twisted, the horse will also be crooked or off-balance.