Former world champion Andy Lee is the latest pro to make the transition from being a fighter to becoming a trainer.
Lee's biggest assignment to date, was being part of the corner for Tyson Fury's February stoppage of Deontay Wilder to capture the WBC heavyweight title at MGM Grand in Las Vegas.
Fury added Lee to his team after parting ways with Ben Davison at the start of the year.
Lee points out that Fury is a very smart fighter, smarter than people realize because of his many antics as a joker.
And Lee also says Fury is the hardest worker in training camp that he's ever seen.
"He's got an unbelievable wealth of knowledge. People don't realize this about him but he's like a boxing historian," Fury said to RTE 2fm's Game On
"He can tell you who fought who and how they won the fight back in 1950. He's got an unbelievable brain for boxing and so a lot of the time within the Tyson camp when we were training, we would work in the gym.
"People see him and he's a larger-than-life character but don't be fooled. When he's in the gym working, he's the hardest worker I've seen and takes it very seriously.
"We would do that every day but also when we would come back from the gym, we would talk for hours about boxing, life, training sessions and how they went, what he felt worked and what he's comfortable with."
Lee, who continues to improve his skills as a trainer, is also working with fighters such as Jason Quigley and Paddy Donovan.
"It's a big transition and it's a lot of work in a different way," Lee said. "Obviously, when you're fighting and training, that's the work. But in terms of when I'm training the two lads and even with Tyson Fury, you're constantly thinking about it.
"You do the session and you're constantly analysing the session in your head and thinking about which ways they can improve and what I could have done differently to communicate to them. I'm quite fortunate in the sense that I'm still able to display the technique and sometimes you learn more from what you see than from what you're told. So if there is something that I can see that they need to make an adjustment [on], I can easily get up in the ring and display it for them in a specific way.
"That's something that has helped me in still being in touch with boxing. But as the fighters have progressed, so have I. I'm less than a year now coaching but you just draw on all your experience and constantly thinking about my career, the fights I had, my coaches, how they spoke to me, words they would use, things they taught me and just try to impart that in the best possible way."