As a creator and co-star of Dirty Sanchez, MTV’s notorious noughties prank show, Matt Pritchard’s job description was essentially being filmed doing stupid stuff whilst being drunk and high. The show made him a global star but it came at a price. Matt has spent the last decade kicking drugs, alcohol and re-inventing himself as a clean, ultra athlete using diet and fitness to fight his demons. In “Wild Man to Iron Man” a BBC Wales documentary made…