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.
Complete as many rounds and reps as possible in 15 minutes of:
155 pound Deadlift, 9 reps
12 Push-ups
15 Box jumps, 24" box
Paige Nutt 10 rounds + 9 deadlift (100lbs).
Post rounds and fractions of rounds completed to comments and/or register and submit your results as part of the CrossFit Games Open.