He single-arm is a classic exercise, but it's not always done correctly. You'll often see people rocking their entire upper bodies on the move, putting their lower back at risk for injury and not getting the most out of the row.
That's where this TRX row comes in, because it forces you to keep near-perfect form. It's an exercise that will keep you honest on all your single-arm rows, and combined with a at the end that's also on the , it makes a perfect finishing move to a pull-day workout.