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I've never been a fan of running on treadmills... lately I have been doing a lot of LISS on treadmills though with good results.
I've never heard that running on concrete was better for you... you aren't ever going to run someplace that is perfectly flat... so I'm not sure how much sense that makes... but maybe thats why he has a phd. ;)
As far as working out... there have been studies recently that show LISS is just as or almost as effective as jogging.
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