Starting lying on your back perpendicularly to the barbell while holding the end of the bar in your hand that is further away from the landmine attachment. Your elbow should be rest on the ground at a 45 to 60 degree angle from your torso, with your wrist stacked over your elbow.
Drive the end of the bar upwards, squeezing your chest at the top of the movement. Lower the bar back down until your elbow gently touches the ground.
Repeat for the desired number of reps on one side before switching sides.