I lean a little sideways and I noticed the horse doing the same what should I do?

A rider who leans sideways and a horse that mirrors that lean is one of the clearest and most direct examples of how the rider's position influences the horse's way of going — and it is a useful diagnostic relationship precisely because the horse's behavior makes the rider's position problem visible in a way that the rider cannot feel from inside the problem. Most riders who lean sideways do not know they are leaning, because the lean has been present long enough that it feels vertical to the proprioceptive system that is supposed to tell the rider where her body is in space. The horse's sideways lean is the external feedback that confirms what the rider cannot feel internally. The cause of a habitual sideways lean in a rider is almost always an asymmetry somewhere in the body that produces unequal weight distribution between the two seat bones — one seat bone consistently bearing more weight than the other, one hip consistently lower than the other, one shoulder consistently dropped toward a specific direction. The sources of this asymmetry are numerous: a structural scoliosis that tilts the spine laterally, a hip flexor or hip rotator tightness that is greater on one side, an old injury that has created compensatory patterns, a leg length discrepancy, or simply the habitual postural asymmetry that most people carry from the dominant-side activities of daily life. The horse mirrors the rider's lean because the horse's weight distribution directly follows the rider's weight distribution — when the rider consistently puts more weight through the left seat bone, the horse's barrel tips slightly left, his spine curves slightly left, and his movement becomes laterally asymmetrical in a way that reflects and accommodates the asymmetrical load he is carrying. This mirroring is not the horse doing something wrong — it is the horse making the biomechanically sensible adjustment to an off-center load. Correcting the horse's lean without correcting the rider's lean is therefore not only ineffective but physically inappropriate — the horse will return to the lean the moment the rider's asymmetry returns. Video from behind and from the front is the most immediately useful tool for a rider who suspects a sideways lean but cannot feel it. A two-minute video of the rider trotting on both reins, filmed from directly behind and directly in front, typically reveals the lean clearly. Watch specifically for the alignment of the shoulders relative to the horse's spine, the relative height of the two hips, and whether the rider's head tilts to compensate for a body lean in the opposite direction — the head tilt compensation is a particularly common pattern in riders with habitual leans. Specific corrective exercises both off the horse and on the horse address the lateral lean once its direction and source are identified. Off the horse, yoga and Pilates exercises that develop lateral core strength and hip symmetry are the most targeted approach. On the horse, exercises that specifically challenge the rider to find true vertical — riding with eyes closed and asking a ground observer to call out when the lean appears, placing a whip across the thighs and checking that it lies level — develop the kinesthetic awareness that allows the rider to feel neutral rather than simply assume it.