There were 1,200 applicants to the BBC for this documentary, 6 were chosen to appear and only 5 applicants made it to the final cut of the documentary. The 6th participant had to pull out of the course as his child (baby) had taken ill (nothing serious!).
Graham decided during the filming of the documentary that he was going to attempt 10 Tough Mudders in 2015, this was announced to the director, Luke Sewell, during a filming session. He went on to complete all 10 successfully, managing 7 with a severely sprained ankle, going against medical advice to stop after the 3rd Tough Mudder.