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From Fellrnr.com, Running tips
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→External Links
* A comparison of ultramarathon difficulty based on finish times - http://realendurance.com/index.php?FinishTimeList&s=ul
* A compendium of links to other ultrarunning sites, including a race calendar and the most comprehensive list of ultra marathon training programs I've found. http://www.ultramarathonrunning.com/training/index.html
* One of the best ways of understanding your muscles is Body Smart, a flash based site that animates the muscles of the body. http://www.getbodysmart.com/ap/muscularsystem/menu/menu.html
