As much as rowing seems like an exercise in the arm, most of the strength for each stroke really comes from the leg push. It's also important to note that it's not just how many strokes a minute you can do, but about the quality of each stroke and how much space you can create for each stroke.
800 meter Run (together) 50 Pull-Ups 100 Push-Ups 150 Air Squats 800 meter Run (together) 30 Pull-Ups 60 Push-Ups 90 Air Squats 800 meter Run (together) 20 Pull-Ups 40 Push-Ups 60 Air Squats 800 meter Run (together)