These will challenge you more than any dumbbell row. You'll be essentially rowing your bodyweight with one arm.
Don't let your shoulder shrug up, keep your core braced, and pull with control. You'll feel your core work double-time to stabilize the offset load. Your pulling muscles will also contract deeply. To make it easier, simply go flat footed or adjust your angle.
If you've been reading Testosterone for any length of time, you've figured out that each article is just another piece of the weightlifting puzzle. This one's about a big piece of the puzzle, one that's often neglected: the brain.