This is a great exercise for warm-ups, shoulder mobility and stability, and for hypertrophy. I would suggest using the same grip width as you use on your bench press, but it will depend on your range of motion.
Elbows should be beneath the wrists in the front and back position. Press the bar up just high enough to clear your head, rotating from front to back.
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Tried every shoulder exercise? Probably not this one, which is also great for functional core strength.