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.
Are you 30 years old but feel like you've got the spine of a 90-year-old well digger? Michael and Cassandra can cure what ails ya'. Practice their deloading drills regularly and your spine will soon be as straight and springy as a young poodle dog's tail.