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The shoulder muscles that contribue to the broad shape are primarily the deltoid muscles. This is the muscle that forms the bulk of the shoulder muscle mass, with three heads (Anterior, medial and posterior) that inserts on the humerus. This muscle is primarily involved with shoulder abduction, or moving the upper arm out away from the body. So for ...


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I have broken down the main strokes into their activated muscle groups. Note, you will have to do a lot (and I mean a lot) of swimming to see a big increase in your shoulders. It would be more efficient to follow a bodybuilding/powerlifting programme. Freestyle and Backstroke Core abdominal and obliques are important in rotating the torso for a longer ...



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