...CUT...please don't every use that word again!! You want a six pack? You want it faster? Up the workout time, add another day on, and I personally would start at the track. HIIT is very sucessful, but you should start out slow because it is a killer. Try this dude,
Sprints
8x100 yard sprints-around 60 seconds rest in between.
----after a while simply up the amount of sprints and sets and maybe decrease the resting time by around 5-10 seconds----
This does not give you the same affects on your heart that distance running would, but it loses the fat fast without much muscle loss.
***six pack=good diet and cardio***
You want to know something interesting? You can do crunches until you feel like you're going to vomit, and you still wont achieve that six pack. In actuality, you do not even HAVE to do 1 single crunch! I never do crunches, and I have a very defined six pack (not bragging just attempting to convey a point). Did you know that compound lifts such as bench press and incline press workout your abs? Mainly, a good diet, along with cardio and your regular workout will make the abs come out. It takes time though, lowering your bf is a gradual process so be patient!
scott