At last fall's Full Moon Farm Horse Trials, 16-year-old Miriam Keefer guided her horse, Micky, over the final cross-country jump with quiet determination and a flash of joy. It was her first recognized event at the Novice level, and she placed second out of 16 competitors—qualifying her for both the USEA American Eventing Championships presented by Nutrena Feeds and a long-format three-day event.