Place an Olympic barbell into a landmine attachment or secure it against a wall so it can’t slide backwards. Stand tall and take a split stance position with your left leg forward. 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 split stance position when you alternate sides.