Individual Row Workout

On my own today, so I tooled around in the workout section of the rower and found this little doozy:

Row for 1:40 seconds/:20 second rest between intervals X 9. Count the meters rowed per interval. My results below:

1) 481
2) 461
3) 466
4) 468
5) 478
6) 476
7) 472
8) 471
9) 489

That 20 second rest aint much as you get deeper into the intervals. Good way to build speed.