Mill-Again specializes in saddle seat riding lessons on American Saddlebreds, horses known for high-stepping and showy actions. This Plano stable offers 25 lesson horses, including gentle mares for beginners and advanced show horses for those seeking a challenge. Private lessons start at $50 for a half-hour. Groups lessons start at $40 for a 45-minute session. Kids here ride as soon as they can sit up: Mill-Again offers 15-minute Tiny Tot lessons for $25.