"Seeing Double" 

Aim to make the second interval faster than the first using the same stroke rate. Rest 1 minute between each interval. 

5 minutes @ r20 x2
4 minutes @ r22 x2
3 minutes @ r24 x2
2 minutes @ r26 x2
1 minute @ r28 x2

So you'll do 5 mins, rest, then do another 5 mins (faster than the first time) repeating this cycle all the way through the 1-minute interval. Started conservatively with the idea that I would nudge the rate up by :02 with each interval. Felt good throughout. Drag set to 119 as always.