http://davesproducts.com/the-science-of-hiit-understanding-your-body-so-you-can-get-more-out-of-it-part-2/

The Science Of HIIT, Understanding Your Body So You Can Get More Out Of It
Part - 2

How We Progress Through Energy Systems
So if you head outside and start jogging, you’ll notice that at first, you don’t need to gasp for breath in order to maintain your speed and your heartrate doesn’t immediately go crazy...Read More..

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