Using a barbell in a landmine attachment, stand facing the barbell with the feet shoulder-width apart so that the left foot is slightly ahead of the right foot. Grip the end of the barbell in the right hand and keep the right elbow tucked-in directly next to the body. Sit back onto the hips for a partial squat (about four inches down.) Press the feet into the floor to return to standing while pressing the right arm straight into the air and keeping the elbow facing the center of the body. Repeat for the desired number of repetitions before alternating sides.