[1] From a standing position, grasp a barbell with an overhand grip and hold it at shoulder level, elbows tucked in and under.
[2] From a position about even with the collarbone, lift the bar straight up overhead until your arms are locked out.
[3] Lower the weight back to the starting position.
[4] Note Some lower the weight until their upper arms are parallel to the ground [shown in the photos above] while others prefer to go lower.
Behind the Neck Press:
[1] Lift the barbell off the barbell rack, either seated or standing.
[2] Press the weight straight up, and then lower it.
[3] Repeat the movement.
Tips:
Machines lock you into one narrow movement path, which will not allow for a really full development of the shoulders or any other muscle or muscle groups used. Just remember to use machines to add variety to your workouts, but not as a replacement.
Check out more exercise demos by clicking on the image below:
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