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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Sit on the floor, get a full stretch of the lats, then pull with your elbows as far behind you as you can. Arch your low back and get your chest out.
Trainers get certified and acquire clients by getting results. But the state may soon force them to get licensed and train clients differently.
Chris Shugart recently wrote an article about balance. Basically he said, "Balance good, karate good, everything good. Balance bad? Better pack up, go home."
This drill will help you with that slumped, kyphotic posture. Do about 10 reps in each position as often as you'd like.