The science of intensive interval training has, though, been lagging behind the workout’s popularity. Past studies of HIIT, as the practice is commonly known, had established that as measured by changes in cellular markers, standard short-burst HIIT training may improve aerobic fitness up to 10 times as much as moderate endurance training.
http://mobile.nytimes.com/blogs/well/2014/02/26/how-to-get-fit-in-a-few-minutes-a-week/?partner=rss&emc=rss&smid=tw-nytimes
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