Yeah mate you right. I was doing HIIT for ages and I enjoyed it a lot more, you can pack more in, in a shorter time and get better results.
The reason why I am not still doing it is, I am currently running a
keto diet, which uses fat as the fuel source, instead of carbs, as far as I understand it, HR above 125BPM uses carbs as the fuel source and under 125BPM uses fat as the fuel source. I think I am right here?