"Low: High"  
8 x 2 mins 
Spend the first minute at a lower rate and then step up to a higher rate for the second minute
1: r20-->r24
1: r22-->r26
1: r24-->r28
1: r26-->r30
1: r22-->r26
1: r24-->r28
1: r26-->r30
1: r28-->r32
1 minute rest between rounds

Followed along with DH rowing vid from Rowvember 2021. Was a little slow on the "low" intervals on the back half of this one.