Hold a dumbbell overhead in each hand with the palms forward and lock in the position as you would with a barbell. Keeping the weights 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 dumbbells as motionless as possible with continuous active effort to stay tight.
 
Purpose
The dumbbell overhead carry is a simple way to improve overhead stability. Two dumbbells demands more overhead mobility than a barbell because the arms must be vertical, which is equivalent to a narrower grip than is typically used even for the jerk. Keeping the arms independent also creates a greater stability demand, and helps build and maintain symmetry in strength, mobility and stability.
 
Programming
Distances of 20-60m at a time are generally appropriate for 2-5 sets.