The clues really in the name here I think!
The Sufferfest; I will beat my ass today to kick yours tomorrow
The Downward Spiral; Killer intervals, clear instructions, thrilling footage and great music! Featuring Paris-Roubaix and Fleche-Wallone, it's the most exciting (and freaking hardest!) 60 minutes you'll spend on your indoor bike! ('Pick of the Week!" - Velocast, "4 stars" - Road.cc)
Let’s see if I can walk come Saturday morning!