How do I get rid of the fat on my back wing?

How do I get rid of the fat on my back wing?
Pulley triceps extension

Stand with feet hip-width apart, knees slightly bent, and core engaged. Start with your elbows beside your hips, bent at 90 degrees, and extend your arms down toward the floor until they are straight. Squeeze into the back of the arms at the end of the movement. Repeat 10–15 times.