Sabrina Verjee is attempting to run over all the Wainwrights Fells in the Lake District.
The 525km (326-mile) route covers all 214 tops mentioned in the Wainwright guides and has an estimated 36,000m (118,110ft) of ascent.
Verjee attempted the same run last July and was on course for a new record before knee problems slowed her pace.
She still completed the 3rd fastest time of 6 days 17 hrs 51 mins, and now aims to go under 6 days to beat the Paul Tierney's record.