Current trends in fitness are clearly geared towards High Intensity Interval Training (HIIT).
from Olivia W’s Blog Rss http://www.stuff.co.nz/life-style/well-good/teach-me/91769447/Do-HIIT-workouts-live-up-to-the-hype
from
https://oliviawhinham79.tumblr.com/post/159797207886
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