Paddy McGuinness and a team of celebs head to the Alps to train for a world-first highwire walk. To kick things off, the celebs are eased into their training, with a backwards jump off of Austria's highest suspension bridge.

The team head to the top of Penken Mountain in Austria, 5500 feet above sea level, to work on their focus. But at the cliff edge, Chris Hughes loses control of his fear and questions whether he can complete the challenge.

The celebrities are struggling to hold it together as the mental and physical strain of highwire walking starts to take its toll. Then they're confronted with their toughest physical challenge to date, conquering the 400-foot Schlegeis Dam.

The celebs enter the last stage of highwire training in Austria, as they tackle a knee-trembling walk between two platforms 650 feet in the air, ahead of their final challenge in London.

It all comes down to this. Paddy McGuinness leads the team of celebrities in a gravity-defying, world-first relay highwire walk 100 feet above the London Stadium.