RoW
Interval Variable.
3 rounds of 400m - 300m - 200m - 100m
Rest is 1' - 45sec - 30secs between
3' between rounds
Playing around with 1k intervals (in a nice way ;-)).
Start around 105% and go with feel, use your strength, build into it, recover quickly and repeat.
Check this WattPower workout on the ErgZone app: