Pullups with a wider grip involve shoulder adduction, while pullups with a narrow grip involve shoulder extension. The muscles involved in both of these articulations are nearly the same, but it is good to train both functions of these muscles.
Pullups with a pronated grip involve maintaining a state of of internal rotation, while pullups with a supinated grip involve maintaining a state of external rotation. The muscles involved are slightly different. Using a supinated grip should call on your rear delts more, as they are an external rotator. A supinated grip also allows for your biceps to move some additional weight.



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