I have a huge knot between my shoulderblades - my rhomboids, which always take my stress - so today I tried a muscle-exercising machine to see if I can loosen it up. The guy who showed me how to use the machine in question also suggested I row with my arms held higher up, so that I'm coming in with the handle at the top of my bra, more or less. We'll see if it feels better later on today or not.
I had the machine set to 6 instead of 8 so I could go faster today, figuring my heart would work more on speed than on weight-pulling, so I managed 30 strokes per minute, even though my rate was 2:36.0/500, so slowish. I did get my heart up to 156 bpm so I think my strategy was pretty good.