Where do these need improvement? I read that retraction is the key point for row work. My biceps are still screaming by set number 4 (but I was stuck on 3x6 for some time, so the fact that I can manage an entire extra set now means progress is happening even if it's slow). I filmed my 1st and 4th set because my apartment set up is a little wonky to film both my PE and iM seamlessly.