Zercher Carry

This carry involves the load (dumbbell or barbell) being carried at the height of the collar bone. It trains the anti-extension quality in the frontal plane by applying a "flexion force" on the body. This pulls the torso forward so that the erectors must work to keep you upright. At the same time, the anterior core must also activate to prevent the powerful, working erectors from bringing the spine into hyperextension. – Alex Nurse