According to one of his training partners, unified heavyweight champion Oleksandr Usyk is busting up his sparring partners in his ongoing camp.
Usyk is preparing for his upcoming rematch with Anthony Joshua, scheduled for August 20 in Saudi Arabia.
Last September, Usyk outboxed Joshua over twelve rounds to capture the IBF, IBO, WBA, WBO heavyweight titles.
Kazakh heavyweight Nursultan Amanzholov, who helped Usyk prepare for the first encounter with Joshua, is helping the Ukrainian boxer prepare for the rematch.
"He [Amanzholov] says there are days when Usyk goes to war with him. It's not easy to hurt to Nursultan but he's been on the receiving end a few times. But a lot of his heavyweights have been sent back home, if they can't stay in camp. They can't keep up," Amanzholov's manager Aamir Ali told Sky Sports.
"He says [Usyk] is in tremendous shape for this camp. He said as soon as [Usyk] came back from Jeddah, from the press conference, the day he arrived back, he phoned up Nursultan who was sitting in his hotel and said to him, 'I want you sparring today.' Literally got off the plane and started sparring straightaway and [Amanzholov] said he was in a foul mood. He was in a really angry mood, wanted to go to war. Anthony Joshua's in trouble.
"[Usyk] was sending heavyweights, six foot six and whatnot back home. Nursultan was the one of the only heavyweights that he kept on throughout the whole camp. Because he would actually challenge him and give him a very tough time and from what I understand there were points where Nursultan was being told by Usyk, 'No I need you to come on harder.' Like don't hold back on me, just go to war."
Joshua has made several adjustments to his training team to get ready for the rematch.
He parted ways with career trainer Robert McCracken and secured the services of veteran coach Robert Garcia.
