I don't have an ax to grind. I literally don't want people trying to get in shape to waste large amounts of time and hurt their knees and so on doing long distance running when it is so much inferior for losing weight and maintaining fitness. I want to steer them in the right direction. They will have so much more success training in other ways.
It is common knowledge at this point that interval training, sprints, and properly done strength training produce all the same cardiovascular health benefits as distance training but without the repetitive stress and other physiological stresses of long distance. Also without the huge time investment. Also with much better body fat percentage measurements. You can use google as well as I can.
http://well.blogs.nytimes.com/2008/06/05/for-heart-health-sp...
http://www.walesonline.co.uk/news/health-news/2008/11/01/sho...