ONE-ARM BENT OVER ROW (With support) In this variation the load on the spine is much smaller than without support. Therefore it is possible to work with greater weights in order to challenge the shoulder extensors (latissimus, rear deltoid and other synergists) without creating high loads on the spine. Working with one arm activates the oblique abdominals and spinal rotators more heavily, they stabilize the spine and prevent horizontal rotation which is created by the pull of the weights to one