One of the biggest gaps limiting the triple jump athlete is an inability to push off the board. This requires proper hip displacement to achieve greater horizontal distance.
In the video below Jeremy Fischer, head coach at the USATF High Performance Training Center, show you how to help your athletes get great hip displacement off the board.
This drill teaches athletes how to keep their take off leg underneath their center of mass while triple extending through the entire leg system, which promotes a more effective jump off the board.
For more information about the DVD that this clip came from click the the link 20 Drills & Techniques for Teaching the Triple Jump
The YouTube video has audio, so please make sure that your volume is turned up and that you have access to the site. Note that some schools block access to YouTube.