This site gives a logical explanation of intensity vs rest period of high intensity interval training HIIT.
The Best Cardio For Weight Loss: A HIIT Workout Routine to Burn Belly Fat Fast | Not Your Average Fitness Tips
Today I started using the elliptical to do a HIIT workout based on that. Well I couldn't do that just starting out.
I started easy
5min warm up
6x 15:45 intervals on elliptical
5min cool down
I'm going to try to work my way up to the HIIT - cardio - HIIT.