Have you been tracking your heart rate during these cardio sessions? Both of these "4mph on 12degree incline and 4.5 mph on 8degree incline" would put me out of the 60-70% MHR fat burning zone. I know heart rate is dependent on many variables but I typically got with a 10% incline @ 3.5 mph and that puts me right around 125-130 bpm. I also have a heart rate monitor that I use to keep track.





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