Thanks for the replies people and great article musclesntx.
So i'm assuming (lots of info to disect) that if I want to cut weight, my heart rate needs to be below 55% of its max for atleast 35mins. (so my 25min every morning run is useless?

hope not)
Any idea how many calories you will burn in a 40min 55%HR run? Or some formula to work it out?!?
Thanks in advance.
Still not tried HIIT. no watch and i HATE running in circles - i'm soo picky eh!?
MB