What is the correct way to train a spin, and how do I build speed without losing correctness?

The spin is one of the most visually dramatic maneuvers in reining and one of the most technically demanding to train correctly. Judges score it on cadence, smoothness, and correctness of footfall — specifically that the inside hind foot acts as a pivot and plants consistently while the horse crosses its front legs and rotates around it. Speed earns admiration in the arena, but speed built on a faulty foundation earns penalties, and correcting a fast but incorrect spin is far harder than building a slow correct one from the beginning. The training process starts from the ground up, literally. Before asking a horse to spin under saddle, it should understand moving its front end around a stationary hind end from light rein and leg pressure at a standstill. Many trainers establish this understanding through slow, deliberate turns on the haunches at a walk, reinforcing the concept that the front end moves while the hind end stays put. This foundational work teaches the horse where its body should be before any speed enters the picture. Under saddle, begin the spin at a controlled, almost exaggerated slowness. Use an opening rein in the direction of travel and a supporting outside leg to keep the hindquarters from drifting. The horse should cross its front legs cleanly with each step. If it stops crossing, drags a foot, or swings its hind end out, slow down further and reestablish the correct footfall before continuing. Correctness must be established at slow speed before it can survive at fast speed. Speed develops naturally as the horse gains strength, balance, and muscle memory. Many trainers find that horses begin offering more speed on their own once the movement becomes comfortable and confirmed. Chasing speed before the horse is ready produces a scrambling, flat spin that is difficult to score well and harder still to fix. Finish every spin with a soft, quiet stop of the cue and let the horse stand a moment. How a horse comes out of a spin is part of the picture judges see.