I agree with Elsie--in fact, any level is relative as my advanced may not be someone else's advanced. (Back when I used to run someone would say they saw me out jogging. I would correct them and say at a 7:30 pace I am running and not jogging. Maybe if I was a world class athlete the pace I was running would be a jog!) I've done almost all of the ICE series now and on some of it I quickly went with heavier weight when I was barely feeling a challenge. I find doing just the blizzard blasts as time saver workouts can be kind of like X10. Of course some of it depends on what sort of effort you put into it or just what sort of day you are having.
Anyway, if you are a seasoned Cathlete you may find, like me, that in some cases you are not even breathing hard but remember high intensity everyday is not suggested so I'm enjoying the ICE series as a new dimension to my workout life. Cathe has added some great functional fitness moves that I think are great.