what exactly IS HIIT

HIIT Rocks

I did my first HIIT workout yesterday for 20 minutes after reading about it over and over and over and over (get the point??) on here. Seriously...it kicked my butt!! I bet I looked really stupid but I had a FANTASTIC work out. I did it on the elliptical and this morning I tried it on the bike... Again.. it kicked my butt.
 
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