Re: HIIT in a gym?
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That said, I am troubled by the implication that running 800 meters intervals would not be HIIT. Its is, if you are running intensely.
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I've never seen an attempt at a rigorous definition as far as the total length of the intervals or the work/rest ratio. There's reliance on "short" and "max effort" or "high intensity." I can't say that 30 min of fifteen 2 min elliptical sprints fits a rigorous definition or not, either. I agree about the 800s even though 800 is too long to be a true sprint "max effort."
I would say that if the workout is taking 30 minutes, then try to crank up the intensity to accomplish the same work in ~20, or consider reducing the workload to what takes ~20 minutes and building from there. And a problem I have with the elliptical, or at least how it is used, is folks don't make adequate use of self-measurement-- OP doesn't appear to be placing greater and greater demands on his body or have any ability to do so.
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