The 27-year-old singer and Atlanta rapper – who are embroiled in a bitter feud and have exchanged blows on social media – will take their fury inside the ring in March and Mike has agreed to train Chris. 50 Cent, 41, arranged for Mike to help with Chris’ training after he placed a bet for $100,000 with Floyd Mayweather, 39 – who is training Soulja Boy – that Chris will win and he posted a video on Instagram of the conversation between him and Mike.