How to do the Barbell Overhead Press

Stand with feet hip-width apart, unrack the bar to your upper chest, grip slightly wider than shoulders.
Step back, keep the bar across your upper chest, and your body straight from head to ankles.
Press the bar upward, straightening your arms fully overhead, and then lower it back down.

Full technique — 8 steps

Set the bar in a rack at upper-chest height and take a grip just outside shoulder width.
Unrack the bar to the front rack, then step back with feet about hip width apart.
Hold the bar across your upper chest with forearms vertical and elbows slightly in front of the bar.
Squeeze your glutes, tighten your stomach, and keep your ribs in line with your pelvis.
Press the bar upward while moving your head slightly back to clear a straight bar path.
Once the bar passes your forehead, bring your head through, keeping the bar over the middle of your foot.
Finish with arms fully extended overhead and shoulders elevated without leaning back excessively.
Lower the bar along the same path to the upper chest and reset before the next rep.