Naps, tacos and 11 world records: how Camille Herron ran 560 miles in six days

The ultrarunner is famed for her achievements in long-distance events. Breaking 11 world records in a single competition may be her finest feat to date

It's a hot winter noon on a Monday and Camille Herron is asleep. She lies on a cot in a tent next to a flat dirt track. Lined with palm trees and white stone and desert grass, it loops two and a half miles along the lip of a large olive-green lake. Over the lake, towers a screen of steep mountains covered in bush scrub. It's one resort among many in California's Coachella Valley and the setting for Lululemon's FURTHER event, a chance for 10 select women to run as far as they can in six days.

It's the penultimate day, and her nap is stretching long - five hours - and the timer by the line is ticking - and Herron has less than 24 hours to run 48 miles. If she can will herself on, she'll break a record that has stood for more than three decades.