2. Dumbbell pressing is more unstable, which can train the stability of your rotator cuff.
3, dumbbell push is safer, throw it if you can't push it.
4, dumbbell pressing can be clipped in, deltoid muscle contraction is shorter and stimulation is better.
Barbell is actually an intermediate state between fixed instruments and free instruments. The seemingly free instrument actually limits the abduction and adduction of the arm, while the main muscles in the chest and back have the abduction and adduction functions of the arm.