Stacked two sessions today.
"Black" which is a 60 minute aerobic workout with no rests, just constant (NP of around 205). Fairly easy going on the legs but made it fast-ish cadence (90-100rpm) so the heart and lungs were worked.
"Whitney" was the second workout. 12 minutes long consisting of warm up and warm down. Slap bang in the middle was the following:
8 x 20 seconds @ 453watts sets with 10 second breaks in between. (Tabata intervals).
Certainly wakes the legs up. Also ended up fighting the gears as the time you change down to spin for ten seconds you are going back up to the big ring again! Legs were flooding with the naughty stuff that is lactate.
Enjoyable all the same.