I haven't been particularly athletic for well over a decade now, but I'd like to get back to it. In the past year or so I have read (ok, skimmed) various posts in the Paleo blogosphere about the problems of "chronic cardio" and the superiority of short intense exercises, but I'm not at all confident that I understand the issues. So, for those who have looked into this more deeply, would something like the Couch to 5K program - in which one ends up running for about 30 minutes at a stretch - be getting into chronic cardio territory? I'm not really going for ultra-marathon types of fitness here; 5k seems like more than enough distance to be able to cover at any one time. Is this level of cardio "safe"? And why would greater intensity be more effective at achieving it? Thanks.
(reference: http://www.fromcouchto5k.com/articles/training/the-couch-to-5k-training-plan/)
