Billi and Cara swapping push-up bras for trainers
Billi Mucklow plans to take her "phone and lipgloss" with her as she runs the London Marathon alongside her The Only Way Is Essex co-star and best pal Cara Kilbey.
The TOWIE star - who is hoping to complete the 26-mile race next month - admitted she is worried her boobs will be round her ankles by the time she finishes the gruelling run in aid of the Samaritans charity.
She said: "There's so much to think about. A friend told us you have to run with a bumbag - I'm not sure we'll able to do that.
"Then I thought I could put my phone and lipgloss in it. But our friend was like, 'No, you need plasters and energy drinks.' And I need a good sports bra or my boobs will be round my ankles by the end. No push-up bras."
The girls - who are also running the London Marathon alongside TOWIE's James 'Arg' Argent - have planned their current training regime around a number of Essex hotspots, and like to treat themselves to a sunbed and a glass of wine mid run.
Cara added in an interview with the Daily Star: "We run from Billi's house to Billi's sunbed shop, then we run to the coffee shop and then we run back.
"We have to stop at each one, so we have a sunbed, then a coffee and then we go back and treat ourselves with a nice wine.
"You don't realise how far it is though. Once I said, 'We'll run to South Woodford, that's really far from us.' But it was only six miles. That's not even far - we'll have to do another 20 after that. So we were thinking maybe we could run to Lakeside and do some shopping for a reward."