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.
In the first half of our two-part interview with Alwyn Cosgrove, the veteran coach talks about business, psychology, and the art of getting clients sore in all the right places.