IKMF competition rule. Jerk (Short Cycle) Rules category.
In Jerk, the kettlebell is driven from the rack position to overhead lockout with fixation. Legs, hips, and arms must reach full extension. The kettlebell must be directly over or behind the shoulder with a complete momentary pause (fixation). The repetition starts from the rack position.
See the interactive comparison on KETTLEBELL MONSTER™ for filterable views and more detail.