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** Also they have a [http://www.ultramarathonrunningstore.com/ UK based running store]
→External Links
* A [http://realendurance.com/index.php?FinishTimeList&s=ul comparison of ultramarathon difficulty based on finish times]
* A [http://www.ultramarathonrunning.com/training/index.html compendium of links to other ultrarunning sites], including the most comprehensive list of ultra marathon training programs I've found.
* The best [http://www.ultrarunning.com/ultra/calendar/index.shtml ultrarunning calendar]
* One of the best ways of understanding your muscles is [http://www.getbodysmart.com/ap/muscularsystem/menu/menu.html Body Smart], a flash based site that animates the muscles of the body.
* If your GPS does not show the right distance on a race, which is right, the [http://www.hamptonrockfest.com/hamptonhalf-GPS.html GPS or the course measurement].