She took part in five marathons in five days, running, jogging and walking through northern England.
Cox travelled through Northumberland, Durham, North and West Yorkshire, finishing in Salford on Friday. She has raised more than £7.6m for Children in Need over the last week.
Speaking to fellow Radio 2 DJ Scott Mills at the finish line on Friday afternoon, Cox said: “It’s just been the maddest, most painful, wonderful thing I’ve ever, ever done.”
“I’ve never had shapely calves in my life,” she joked, “but I have now because they are so swollen, it looks like I’ve been hit with a bat.”
She continued: “We spend a lot of time playing brilliant music on Radio 2… I was singing along at one point like a mad woman, singing along to Blur, and all sorts just to try and push through.
“I would like to thank Chase and Status and Stormzy for [their 2024 song] Backbone. And I’d like to apologise to my son because on telly, if it stays on the documentary, I am singing that song quite a lot and it’s so cringe. So I am so sorry to my kids.”
