with exercise, its been proven many times over and again that HIIT is superior over steady state. they both have their place but for fat loss cardio.. id use HIIT, its high intensity interval training,, this is how it works..on a bike or running or eliptical or whatever.. i use a stationary bike. so 15 seconds hardcore fast as you can, then 45 seconds pedaling slow, or completely resting..well that cycle for two weeks then you do 20 or 25 seconds hard/fast and 40 or 35 seconds resting or slowly running/pedaling whatever. id use two week cycles..eventually youll condition yourself to like 45 on 15 off.