Today's warm-up 200m was a PB at 4:51minutes which is quite satisfying.
For the routine of alternating fast and slow lengths things went well too. I lost 6 lengths or so due to poor button pressing but most of the data was sound. Mid routine I achieved 34.5 seconds for a length which is probably a PB too at 1:44min/100m. By the end of the session my last length was just over 40s so I achieved my goal of keeping under 2:00min/100m.