Stand to one side, near loaded end of barbell, opposite of landmine lever. Lift end of barbell and position near shoulder with underhand grip. With both knees bent, stand with feet far apart (leg on same side of loaded arm is back and opposite leg is forward).
Extend legs forcefully while rapidly pushing end of barbell upward and forward until arm is extended. Lower to shoulder and squat down slightly to original position and repeat. Repeat with opposite side.
Keep back straight when lifting end of barbell from floor. Also see Lever One Arm Shoulder Press for shoulder strengthening.