An ultramarathon is any organized footrace extending beyond the standard marathon running distance of 42 kilometers, 195 meters (26 miles, 385 yards). Ultra races typically begin at 50 kilometers and can extend to enormous distances. There is no limit. -ultrunr.com
Other sites-
http://www.run100s.com/
http://www.ultrarunning.com/
Ultramarthon training plan
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