Sports fans won't want to miss this documentary tonight, especially if you are one that has ever questioned or indeed believed the claims that competing in the GAA Club Championships is the toughest club-based sporting challenge in the world.

Ex-NFL star Roberto Wallace and former England cricketer fast bowler Steve Harmison set out to discover the truth behind these claims as they swap places with Mayo All Star Aidan O'Shea and Tipperary hurler Brendan Maher.