"Single Arm Cable Row" is a video demonstrating an exercise using a cable machine where you perform a rowing motion with one arm at a time. This exercise targets the muscles of the upper back, including the latissimus dorsi, rhomboids, and trapezius, as well as the biceps and forearms for stabilization. The video typically emphasizes proper form, technique, variations, and the benefits of incorporating single arm cable rows into a workout routine to improve back strength, posture, and overall upper body development.