Blue Peter presenter Helen Skelton is aiming high to help raise money for Comic Relief, by attempting a tightrope walk between two chimneys in London.
Helen will be on a wire that's 18mm thick and 66 metres in the air when she attempts the 150-metre walk between the chimneys at Battersea Power Station.
The 27-year-old has been training for her daredevil challenge for months.
If she succeeds on 28 February, she'll be the first person to high-wire walk the length of the power station.
Helen said she was inspired to have a go after watching a film about a man who walked a tightrope between the twin towers of New York's World Trade Centre in 1974.
But she didn't realise how difficult it would be to hold an eight-metre long balance pole in front of her for so long.
"I knew it would be scary and a challenge to stay focused but I really hadn't realised how physical it would be," she said.
"It has been hard work but that's what is going to make me grit my teeth and keep going when my arms burn.
"I only hope I can hold my nerve and keep my eyes on the wire - if I stay focused I'm sure I can make it across."
Helen is no stranger to tough challenges. Last year she raised loads of money for Sport Relief by becoming the first person to kayak down the Amazon on their own.
And she's only the second woman ever to complete the 78-mile ultra marathon in the Namibian desert.
And there's more desert in store for celebrities this year as they trek across northern Kenya for Comic Relief.