Short - 5000m with rate changes every 1000m: 25-22-25-28-25
Row a 5000 meter piece at a sustainable intensity, varying your stroke rate as follows: row 1000 meters @ 25 spm, 1000 meters @ 22 spm, 1000 meters @ 25 spm, 1000 meters @ 28 spm, and 1000 meters @ 25 spm.
Check this Concept2 workout on the ErgZone app: