Makes sense I suppose to train the parasympathetic nervous system as well as the sympathetic. Steady state cardio is one of our guilty pleasures as runners. I try to include at least one HIIT during the week but recently I’ve been guilty of avoiding HIIT coz it hurts too much. I do know for sure that when I do a period of HIIT my 5k time reduces. So I better get back to it if I want to,live longer 😳😩.
What do you do for HIIT? I do 6x400 metres flat out and walk till my pulse drops below 120 (usually 2 minutes) in between.