The Importance of the Jerk Balance For Footwork
The split jerk is actually a two-step jerk in which the rear foot lands first and thus gains traction first. This has the effect of pushing the bar forward under the bar when it is locked over the head.
This exercise teaches the correct "dancing" action of the forefoot while the drive from the shoulders is strengthened in front of the neck. If this is a problem for you or one of your athletes, include the movement at the beginning of the session until the footwork is well anchored.
As more knowledge is gained, the exercise can be gradually moved back in training until it can be completely eliminated.