Jamie Borthwick ended up with a painful foot injury after running the London Marathon.
The 29-year-old actor appeared alongside his 'EastEnders' co-star Emma Barton in character as Jay Brown and Honey Mitchell at the annual road race in some special scenes for the show, but he is now suffering from Plantar fasciitis - an inflammation of the tissue used during walking.
Speaking on ITV's 'Good Morning Britain', he said: "My right foot, second toe. It's not good. It's not pretty. I've got Plantar fasciitis. The soles of my feet are pretty sore. But we're nominating some of our castmates to do it next year, they don't know about it yet!"
The soap stars originally completed the run in 2019 as part of Babs' Army, when they ran in aid of Dementia UK to honour their co-star Dame Barbara Windsor, who passed away from the disease the following year.
This time round, Emma admitted that there was a point where they "hit a wall" but they just had to find the impetus to get through it.
She said: "Scott [Mitchell] organised a group of us in 2019 for Dame Barbara Windsor. We did it together but we're not runners, Jamie and I. We didn't do too well last time, we both got knee injuries but they paired us up again!
"I think that was the drive - we did hit a wall by mile 19, 23 and 24 were tough for both for us. But we just knew that we had to do it. It's quite a risk because ... you just don't know if it's gonna work. But we were OK!"
The long-running BBC soap opera normally films six to eight weeks in advance, but to capture footage at the race on Sunday (21.04.24), film crews had to rush back to the studios in Hertfordshire to edit it in time for the following night's episode.
Jamie added: "We had our four-camera crew set up at the four different areas and they shot our footage and were straight off back to Elstree into post [production] ready for the next day. They've done an amazing job getting it in."
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