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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This accessory lift teaches you to use proper form before moving to the standing barbell press.
If you can hold a plank for longer than 10 seconds, you've outgrown the exercise. Progress it with this resisted variation.
If you're interested in putting size on your legs, it's time to start loving the often ignored and much-maligned leg press again.
You've probably never even SEEN these before. Give 'em a shot!