Is it too soon to start HIIT?

Wow, i am glad i read this thread!

I have been trying to do interval training, albeit not on the treadmill (i use the crossramp)..so what i do is 2 min on lower resistance (4) and ramp 8, then i go 2 min on higher resistance (8) and ramp 12. Lately i haven't been feeling like it isn't all that hard anymore, although about 20 min into it i do feel quite tired, legs a bit shaky etc, heart rate up...but reading this had made me realize perhaps i can push myself even more!

That being said, i think there is a difference between regular interval training and HIIT?
 
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