Kneel sideways, supporting hand under shoulder, top arm reaching long overhead.
Engage core, keep torso upright and shoulders stacked.
Pull top arm down toward hip, using lats and obliques.
Return arm overhead with control, maintaining balance and steady breathing.
Guía de Ejercicio Seitlich kniend – Armadduktion mit gestrecktem Arm - Entrenamiento de Trapezmuskeln (mittlerer Rücken) | MuscleWiki