Apprentice contestant Duane Bryan has said he was fired from the BBC show for being too "honourable", allowing himself to be stabbed in the back by teammate Laura Hogg.
The 29-year-old entrepreneur was fired by Alan Sugar after his team's new fitness regime, Beat Battle, failed to impress health club chains.
Led by wrestler Ricky Martin, team Sterling devised a keep-fit class combining martial arts with street dance, and its flop with gym bosses was blamed on the promotional video, directed by Bryan and starring self-professed dancer Hogg.
Bryan said: "I realise now that being in the boardroom is not about being honourable and talking about what's right. It's about defending yourself and trying to survive."
He defended Hogg's involvement in the task to Sugar, insisting project manager Martin should be fired.
"Maybe I'm too much of a nice guy," he said.
"Maybe I am, maybe I'm not. But I shouldn't have defended Laura looking back, and especially when I saw her reaction when I'd got in the taxi. I knew that she knew what she was doing. She was more experienced than me in that scenario."