I read a Frederic Delavier’s book « Strength Training Anatomy » and there is good stuff.
Sitting with your back straight. Take the barbell with your hand in pronation behind your neck :
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Inhale and press the barbell above your head without arching your back
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Exhale at the end of the movement
This exercice works deltoids (middle part and posterior part), upper trapezius, triceps and serratus anterior. It works a little rhomboids, infraspinatus, teres minor and supraspinatus.
This movement can do standing or with the machine smith. There is several machine to do this exercice with more security.
Warning : To avoid trauma to shoulders joint, rest the barbell higher or lower behind the neck according individual differences in morphology and flexibility.
-Steph
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