Also your rowing form matters, if you're going to spend time on it, learn the basics (just like skiing, but no need to get as obsessive!
My trainer taught me proper form in the "before times." Mine is probably not perfect, but it all starts with the legs, not the arms. Arms are more like the final crack of the whip, just the follow through after pushing with the legs.
I use a Garmin watch to record my workouts. It's terribly inaccurate for my heart rate, but it does give me stroke counts and whatnot. At this point I probably have close to 20 years of workout history on their Connect system.
My lifting is going really well, too. By which I mean, I've managed to avoid injury and joint issues so that I'm still making progress on all the three major lifts. I'm working my way back up to the 600 pound club.