Place a barbell in your jerk overhead position and lock it in forcefully. Keeping it as stable as possible, walk at a brisk pace for the desired time or distance. The goal is keeping the upper back, shoulders, arms and bar as motionless as possible with continuous active effort to stay tight.
 
Purpose
The jerk-grip overhead carry is a simple way to improve overhead stability for the jerk, as well as condition the hands and wrists in particular for overhead work.
 
Programming
Distances of 20-60m at a time are generally appropriate for 2-5 sets.