What groundwork should a young horse have before the first ride?

The groundwork a young horse needs before the first ride is not a checklist to rush through but a genuine foundation that determines how safe and productive the first rides will be. At minimum, the horse should catch easily and stand to be haltered without evasion, lead quietly beside the handler without dragging or rushing, tie patiently without pulling back, stand for grooming and handling all over its body including the ears, mouth, legs, and belly, pick up all four feet willingly, and accept a saddle pad and saddle being placed, removed, and cinched without anxiety or resistance. Beyond those basics, the horse should longe or move freely on a line at walk, trot, and canter in both directions, responding to voice cues for transitions and to body language for changes of direction. It should accept the saddle in motion — stirrups swinging, cinch moving — without bucking or excessive tension. Ground driving in long lines teaches the horse to respond to rein pressure from behind before a rider's weight and rein aids are combined for the first time. Sacking out — accepting contact from ropes, saddle blankets, tarps, and other objects moving around and over its body — rounds out the preparation. A horse that has all of these responses installed reliably is a horse that, when the rider gets on for the first time, has already experienced every component of that ride in isolation. The first ride then becomes a combination of familiar things rather than an entirely new experience.