[Fire-Dragon-DoL]

I did hiit training for a year 3 times per week and now I struggle to get my heart rate up to that same point. My muscles give up or just can't sustain the intensity necessary.

My heart rate goes down way faster, so if I stop for 1 second (literally), my heart rate drops immediately and it takes a lot of effort for it to go back up.

I suspect at this point training in zone 2 is trivial, my body gets naturally there

TL; DR; train hard first, your heart gets stronger and brings you to zone 2 naturally?

I'm no athlete or expert, so please do your research and ignore everything I said