Sit or lie supported, spine long, arms positioned in a t-pose.
Initiate movement by drawing shoulder blades together and down.
Move arms down to your sides, keeping neck relaxed and ribs down.
Maintain control throughout, emphasizing mid-back engagement over arm dominance.
Przewodnik Ćwiczenia Серия 2 — средняя часть спины - Trening Широчайшие мышцы спины | MuscleWiki