Thanks for the tip! I tried it this morning and man, am I beat.
I can definitely see how it works.
I have a general question about HIIT that I'd be interest in hearing people's thoughts on:
There's all sorts of conflicting information on the internet about how much cardio you need, and then it's confused by bringing in HIIT. So I did the OP's workout for 40 minutes, although I took a few liberties (i.e. did fewer after I hit my 20 minutes) to be able to keep it going for the length of time I want to do my cardio. Does this defeat the purpose of HIIT?
Actually, I'm not even sure what my question is. I know the point of HIIT is to do it in short bursts of energy, but is there some other way I'm supposed to adapt this to a longer workout? (I am mostly concerned about length because despite my best intentions, I usually only get to the gym 4x a week).
I've also heard (and then of course I've also heard that it's a myth) that HIIT isn't as effective if you're not doing it first thing in the morning before eating. I work out pretty much first thing in the morning before work, but I eat breakfast first- I've tried the empty stomach thing and it makes me physically ill. Is there any truth to this?