The unevenly distributed load of the single-arm overhead press introduces a tremendous challenge in stabilizing the spine and midsection in the frontal plane.
The objective is to resist lateral flexion of the spine (side bending) and instead remain perfectly neutral while pressing the dumbbell overhead. To master this, many muscle groups will need to kick in, but expect to feel it through the obliques, upper back, and glutes.
Besides being very challenging on the hips and midsection, this exercise is often more shoulder-friendly for those with overhead limitations. Its unilateral nature allows and encourages you to better focus on upwardly rotating and elevating the independently moving scapula.
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