Guinness World Record attempt: 53 marathons in 53 days
6 August 2014 Last updated at 05:11 BST
Amy Hughes from Shropshire is hoping to break the Guinness World Record of running the most marathons on consecutive days.
Currently the female record stands at 17 marathons, while the male record is 52 marathons.
The 26 year-old begins her attempt to run 53 marathons in 53 days in Chester on Wednesday 6 August.
The runner's is hoping to raise £53,000 for the Isabelle Lottie Foundation.