Gaits and rider motion
The default horse jumps a 1.10 m vertical fence. The sequence connects canter approach, hind-leg take-off, flight and landing; the rider folds at the hips as the horse rises beneath them.
Two-point and stirrup length: the jumping setup uses stirrups sized for a seated knee angle of about 90°. The long-stirrup example changes the rider's ability to lift clear of the saddle and make room for the horse's movement.
Horse size: the pony setting scales the rail to about 0.87 m. Body, tack and the rider's leg geometry follow the selected proportions.
The horse follows a constructed jump trajectory with fitted poses. The sequence explains the movement and support relationships; it does not calculate whether a real horse and rider can safely clear a fence.