The Body Coach has announced he will be attempting to work out for 24 hours as part of this year’s Children In Need.
Joe, 35, is hoping to raise millions after signing up for next month’s “savage” ordeal, and admitted he could “burst into tears”.
“It’s going to be tough, I’m not going to sleep, there’s no end to it. I’ve just got to keep going,” the virtual PE teacher told the PA news agency.
“It will be draining and I know that when you get true fatigue and you’re really exhausted, you get really emotional.
“I’ll probably end up, at some point, bursting into tears.”
He added: “But hopefully people will be there to pick me up and say, ‘Come on, keep going’.”
He continued: “My biggest concern is just the tiredness, I think when it gets to 3, 4, 5am, I’m going to really want to cry myself to bed….
“It’s going to be savage. It’s going to be really intense, really draining.
“But at the same time, I think every single hour that goes by, if I can see the money climbing up a little bit, I’ll be like, ‘Come on, one more push, let’s get another million’.
“This could raise one million, it could raise five million, we just don’t know.
“I’m hoping we can raise big numbers and get loads of money in that Children In Need pot this year.”
The challenge will see Joe do everything from his signature HIIT workouts to rowing, using the treadmill and yoga.
He will work out live on BBC Radio 2 from the BBC Studios in London and viewers can watch his efforts on the Red Button and BBC iPlayer across the 24 hours.
Joe, who was recently made an MBE, has been advised he should try to consume 10,000 calories during the fundraiser – the same number he will burn through.
“Hopefully, I’ll have predominantly healthy food but with the odd chocolate bar or packet of fruit gums,” he said.
“I want to keep my blood sugar levels stable rather than just smashing the sweets and the chocolate.”
Last year, Rylan Clark-Neal took part in a 24-hour karaoke challenge for the charity, with surprise guests joining him.
In previous years, the likes of Dermot O’Leary, Sara Cox, Tess Daly and Claudia Winkleman have taken on the 24-hour danceathon.
The Joe Wicks 24-Hour PE Challenge will begin at 9.25am on November 12, with Wicks hoping to keep going until 9.25am the following day.