BikeErg - Session of the Week
Variable Distance 21k cont. (4k/1250/4k/1250/4k/1250/4k/1250) 58%/74% 4k PB pace +17-18 seconds on 4k sections; 4k PB pace + 9-10 or faster on 1250m sections.

Check this GARAGEATHLETE Fitness workout on the ErgZone app: