Are women better than men at ultra-running? American athlete Rachel Entrekin has made history by becoming the first female to win the Cocodona 250 ultra-marathon.
Woman beats all men in 250-mile race
Record breaker: American athlete Rachel Entrekin has made history by becoming the first female to win the Cocodona 250 ultra-marathon, shattering the previous course record. Glossary
Arizona - A state in the southwest USA with a population of more than 7 million.
Endurance - The ability to keep doing something difficult, unpleasant, or tiring for a long time.