DJ Jo Whiley has had to have her blisters lanced and her thigh taped up as she battles with aches and pains during a 26-hour treadmill challenge.
The Radio 2 host is stepping closer to her target with her ordeal due to end at 10pm as she raises funds for Sport Relief with her feat on foot.
Jo has been in a perspex box outside Broadcasting House in London and has been joined by a number of celebrities who popped in to support her - with Ricky Wilson, Will Young and Elaine Paige among those who have helped out.
Winter Olympic gold medal winner Lizzy Yarnold, Clare Balding and Sally Gunnell have also visited and Jo was given some sweet treats by The Great British Bake Off winner Frances Quinn.
She had a brief break as she had her blisters treated, with broadcaster and singer Michael Ball serenading her during the process.
She has also been strapped up with sports tape and said: "I don't know what the technical term is but I've hurt something in my thigh and it's there to hold it together."
Jo has also been kept going by distractions such as a performance by Klaxons, and Ashleigh and Pudsey.
"My legs are beginning to hurt," she said a little later.
Jo's challenge is part of BBC Radio Around the World for Sport Relief, in which figures from BBC Radio are attempting to run, swim and cycle 25,000 miles which is roughly equivalent to the distance around the equator.