IKMF competition rule. Jerk (Short Cycle) Rules category.
In marathon Jerk with a single kettlebell: the arm can be changed only by lowering the kettlebell halfway through the legs and bringing it to the rack position on the other side. The athlete may also choose to clean the kettlebell with 2 hands to switch sides. The free arm must not touch the tool for rack position. Multiple switches are permitted.
See the interactive comparison on KETTLEBELL MONSTER™ for filterable views and more detail.