Anthony Joshua has spent four days in a pitch black room as part of a bizarre training schedule.

Joshua, who is the former WBA, IBF, WBO and IBO heavyweight world champion, last entered the ring against Robert Helenius at the O2 Arena in London back in August.

This week, it was reported that Joshua spent £2000 on a darkness retreat.

Joshua spent four days in a room alone with no light at all.

On Monday, the 34-year-old wrote on social media: “Myself and [my friend] are about to embrace the darkness and solitude for four days (separate rooms).

“Isolated with nothing to do except relax and clear the mind while being immersed in infinite darkness.”

The darkness retreat is a method of meditation to help athletes be alone with nothing but their thoughts and has been used before by NFL star Aaron Rodgers.

Speaking about his experience, Rodgers told McAfee’s YouTube podcast: “It was a great reset for me, for my body and my mind. Maybe a little bit longer than I needed. I feel like by the time I got to the fourth day, I was like, ‘Alright, I’m ready to come out’.”

Since his victory against Helenius, Joshua has been linked with a bout against American Deontay Wilder but nothing has so far materialised.

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In a career that included Olympic Gold and multiple world titles, Joshua has revealed he has one or two regrets.

He told Men’s Health: “Wake up, get on with your day, train. After losing fights, you question yourself and start realising the mental side is as important.

“I would have been more disciplined. I don’t know if that would have made me better, but I would have done things more professionally.”