This is a video that explains how to improve the trail leg for young hurdlers. I have found this to be the most important thing for athletes that are new to the event, as it is absolutely paramount if you want them to three-step. Since three stepping is the most important thing young hurdler can accomplish to improve their times, having a big and fast trail leg is of the utmost importance.
Long, Triple and High Jump Training
High Jump - Beginner Tips