I have done steady rate cardio for the bulk of my cardio exercises. I recently found out about HIIT and it's after burner effect and am interested to give it a try.
I am still apprehensive about trying it out because of the high heart rate doing it would involve. The reason why I am apprehensive is because of people like Dr. Maffetone and his Maffetone method which cautions of having too high heart rates during exercise. Maffetone method in a nutshell advocates very low heart rates when doing cardio.
Is HIIT really safe for the long term ?