Huh? unsupervised? Sounds like BS to me. Anything you can do with the KB you can do with a DB....so would KB exercises with a DB count? Have your rower find out for us!
"And for crying out loud. Don't go into the pain cave. I can't stress this enough. Your Totem Animal won't be in there to help you. You'll be on your own. The Pain Cave is for cowards.
Pain is your companion, don't go hide from it."