Coaches are stunned when Oleksandr Usyk does FIVE HOUR swims in preparation for Anthony Joshua's rematch

OLEKSANDR USAK has done everything to prepare for his rematch against Anthony Joshua. However, he left his team stunned by a crazy swimming session.

The champion unified heavyweight has been exercising THREE TIME per day at his Dubai training camp to defend his maiden title.

Uysk has always been fond of swimming, but he surprised his former opponent Derek Chisora by doing lengths in the pool for FIVE HOUR on a recent visit to a Russian spa.

Del Boy stated that the owner had a surprise for him and told me to be patient.

"I sat down, and all I heard was Deek, Deeerrrrek," just like he said during the build up to our fight.

"I began to talk and laugh with him, and I said that he looked tired. I was then informed by him that he had just finished five hours of swimming.

"I told him that he was lying and that he couldn’t swim for five hour.

"But his trainer assured me that it was true, and then showed me a clip of him swimming in an Olympic pool for five hours.

Usyk has gained several pounds through his intense training sessions over the past year.

For his Tottenham tussle last September with AJ, the undefeated Ukrainian weighed in at a solid 100kg (224.55lbs). He won by unanimous decision.

AJ vs Usyk 2, live stream, and TV channel for blockbuster rematch

However, his training photos show that he will be a little heavier for the Saudi showdown next Saturday.

Amir Khan, a former champion in unified light-welterweight, recently met with Usyk in Dubai. Usyk claimed that he has put on 15 kilos.

SecondsOut was told by Khan that Khan looks much bigger.

"It was his explanation that he had gained 15 kilos since he last fought AJ. So, we're going see how strong he is going to be.

He looks like a natural heavyweight. He's big and strong.

He was not a cruiserweight. His body was full and defined when he was pushing the pads.

"He is very thick, and you can see the solid muscle that his body has."