Place an Olympic barbell into a landmine attachment or secure it against a wall so it can’t slide backwards. Come into a half-kneeling position directly in front of the end of the bar with your left leg elevated. Grip the end of the barbell firmly in your right hand and hold it directly in front of you, resting at your right shoulder. Place your left hand on your hip for stability. This is your start position. Keeping your core braced and maintaining a firm grip on the bar, forcefully push your arm away from you until its fully extended. Exhale as you do so. Reverse the movement with control to return to the start position. Inhaling as you do so. Repeat for the required number of reps (or time) on one side before changing to the other. Be sure to change your half-kneeling position when you alternate sides.