Stabilizing the shoulder under load requires work of the smaller muscles in the rotator cuff, not just the big pec major. By using alternate presses, one calls on these muscles to stabilize the joint and the core to brace the countermovement. Just need to be careful in ramping up the weight. For more advanced stability, do alternating BP while the back is on a stability ball. BP machines and simultaneous arm presses don’t train the shoulder joint stabilizers or core counter-rotation (important in the long-axis strokes) nearly as effectively.
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