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.
Tabata back squats, 95 lb.
Rest 1 minute
Tabata L-sit
Rest 1 minute
Tabata ring rows
Rest 1 minute
Tabata handstand hold
Rest 1 minute
Tabata row
The Tabata interval is 20 seconds of work followed by 10 seconds of rest for eight intervals. For L-sit and handstand hold, count the number of seconds maintained in the hold.