You have two options of either performing this exercise standing or kneeling.
While either standing or kneeling, pick up the end of the barbell with weights loaded onto it and start with the end of the barbell in your hand and in front of your shoulder.
Keep your core tight, and press the end of the barbell up and away from you, then slowly lower it back down to your shoulder.
Once you’ve completed the number of repetitions you’re aiming for, switch arms to do the other shoulder.