HOW: Holding a barbell in a landmine rig with one hand in front of your shoulder on the same side while in a split stance position, perform a strict overhead shoulder press. The foot that is back should be on the same side that you're holding the barbell. Repeat on the opposite side.
FEEL: You should feel your triceps, deltoids, and shoulder blade muscles working. You will also feel your core and lower body working to maintain position.
COMPENSATION: Do not arch your back, do not shrug your shoulders. Do not lose your balance or lean side-to-side.