She was back in her native Australia, but emotionally Ms Guli felt a long way from home.
Why am I doing this, she asked herself, of her attempt to complete 40 marathons in 40 days across six continents.
But Ms Guli resolved to work through the pain. She laced up her running shoes, pulled on her shorts and shirt, and "got the miles done".
"It wasn't a pretty day, there were lots of tears but I got through it," Ms Guli tells the BBC. "I don't run because I enjoy running, I run because I want to raise awareness about water issues."
