I too have wondered if the Blizzard Blasts are hiit workouts, steady state or metabolic... or perhaps all three are used within the various blasts.
Perhaps Cathe will give us her opinion...
Candice, Cathe has excellent articles in her blog that answer your question. Here are links to two of them, but you can explore this interesting topic further by simply using the search bar when in the blog section of the website.
Hiit (High Intensity Interval Training: a short period of tough cardio work - usually less than 1 minute - followed by short periods of less intense active recovery - such as walking around to catch your breath
- repeating this cycle several times)
http://cathe.com/science-behind-hiit-training-effective
Metabolic workouts (movements designed to raise the metabolism and gain that 'after-burn effect' through raising the heart rate while using resistance - generally with lights weights or one's body weight)
http://cathe.com/types-metabolic-resistance-training
Healing11, Cathe has a metabolic rotation - January 2014. It doesn't include programs released in the last two years, but may give you some more ideas to add to your list. I too am keeping lists of the various types of workouts so I know what to pick from on a given day.
http://cathe.com/cathes-jan-2014-metabolic-rotation
Jane PG