This what world record holders have to do Amy:
I am currently a member of North York Moors AC and became a serious runner in 1994 when I completed my first 100km and 24 hour race, winning gold in the National Championships at both events, still the only person to take both titles in the same year. This was at the age of 30 and gained my first international vest that year. Between 1994 and 2011, I represented my country on 27 occasions, winning several medals as well as further National Championship titles. My 100km best remains at 8 hrs 12 mins, my 12 hours best at 128.8km and my 24 hours distance at 226km (140 miles).
Towards the end of my international career I progressed to longer and more extreme races. In 2011 I was ranked World Number 1 for 6 days on the road with my British Record of 750km, a race I won outright as the first person. I also ran my toughest race that year which was the world’s highest race, La Ultra-The High, a distance of 222km up to altitudes around 18,000ft in the Himalayas. Another race where I chicked the men and reduced the outright course record by over 11 hours. That year was quite busy and finished by breaking the Guinness World Record for the furthest distance run on a treadmill in 7 days. My distance of 833km added over 100 miles (160km) to the existing female record and nearly 50 miles (80km) to the men’s record. It is rare that a female world record is better than the male world record in athletics!
http://www.sharongayter.com/