I read a Frederic Delavier’s book « Strength Training Anatomy » and I learned good stuff.
Sitting on a incline bench between 45° and 60° with dumbbells in your hands and your arms slightly stretched vertically :
Inhale and spread your arms to horizontal
Lift your arms to the vertical while exhaling
This exercise works the upper part of the pectoralis major (upper chest). This exercise is to do with lightweight to avoid injury.
This exercise and the « pull-over » are exercises to develop a good thoracic extension.
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