This challenge was chosen by Mercian Fitness Row six intervals of 250m at 20 (or fewer) strokes per minute. Rest is one minute. Record the 250m result for your slowest interval There is a restriction of 20SPM. The whole piece has to be done at a maximum of 20SPM (If one interval is over 20SPM then the piece is invalid). http://www.c2ctc.com/index.php?c_id=236