GGG needs to take english lessons from the Krusher

Actually I think it was Don Turner's gym they stayed at (or one of the surrounding buildings).

'Don Turner says he first saw Evgeny Gradovich about two years ago on a scouting mission to Russia. Evgeny at that point had been an amateur boxer and in Russia compiled a record of 126 wins in 150 bouts. One of those few losses, ironically, was the Russian national championship which the American scout came to watch. Still, Evgeny caught the eye of Don Turner and Egis Klimas, a Lithuanian-born boxing manager, and they thought, as Turner put it, “This guy might be better than all of them.” Klimas arranged for Evgeny to come to the States and asked Don to train him for professional boxing.

Which is where Don’s training camp in Arapahoe comes in. It’s a cluster of metal buildings, down a dusty road where woods surround fields of corn and cotton. (That’s one of the advantages: in Arapahoe there are few distractions for a young fighter.) Don’s trained other boxers there over the decades, but this past year and a half, he’s been focused on bringing Evgeny along.

From Kovalev's website (maybe it's from the interview you're talking about?)

'It was very heavy time for Sergey, as well as for all my boxers. I was helped besides by Don Turner. It in Northern Carolina has a training camp. All boxers who came from the countries of the former union, surely passed through it. Don Turner the big expert, it fulfilled 10 years with Holyfield. It in camp, really, doesn't have anything except corn fields. There many came, but not everyone survived, there it was really difficult. They couldn't go to shop and buy candies, there was all under control. There it was impossible even to go to bathe without permission or to ride a bike. Kovalev spent there about a year, Gradovich about one and a half. They were one of the few who sustained everything. Now both of them are champions.'