I read a Frederic Delavier’s book « Strength Training Anatomy » and there is good stuff.
Sitting on a bench with your back straight. Take dumbells in pronation (thumbs inwards) at shoulders height :
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Inhale and press to have dumbells over your head
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Exhale at the end of the movement
This exercice works deltoids (mainly medial deltoids), trapezius, serratus anterior muscle and triceps.
This movement can be done standing or alternating arms. The seated version helps to prevent excessive arching of the back.
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-Steph