It was a sprint finish for DJ Jo Whiley following a "life-affirming" 26-hour treadmill challenge.
The Radio 2 host stumbled off the treadmill before 10pm after a dramatic 10-second countdown and said she could not believe that she fell at the end following her feat on foot to raise funds for Sport Relief.
Jo had been in a perspex box outside Broadcasting House in London and was joined by a number of celebrities who popped in to support her.
Winter Olympic medallist Jenny Jones joined the DJ for the final few minutes and suggested that they sprint to the finish.
Moments before she completed her challenge, Jo said: "I have no voice left. I have no breath left.
"It's just been the most emotional experience, the most life-affirming experience, I've ever gone through."
Jo took a tumble as she got off the treadmill and said: "I can't believe I did 26 hours and then fell at the last minute."
Addressing a crowd which had gathered, she said: "It's been quite tough to be honest with you."
Earlier tonight she was joined by celebrity cook Nigella Lawson who brought her fudge and advised her on what she should have for breakfast tomorrow.
"I think it has to be a full English," she said.
Nigella got on to the treadmill beside Jo but said: "In heels I don't know whether it's that sensible."
The foodie said she has a treadmill at home.
"You can't eat as much as I do and not have a treadmill," she joked.
Jo had to have her blisters lanced and her thigh taped up as she battled with aches and pains.
She had a brief break as she had her blisters treated, with broadcaster and singer Michael Ball serenading her during the process.
Ricky Wilson, Will Young and Elaine Paige are among those who have helped out. Winter Olympic gold medal winner Lizzy Yarnold, Clare Balding and Sally Gunnell have also visited and sweet treats were provided by The Great British Bake Off winner Frances Quinn.
Jo has also been kept going by distractions such as a performance by Klaxons, and Ashleigh and Pudsey.
Her challenge was 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.