Anthony Joshua is stepping up his preparation for this month's title defence, and showed off his impressive physique to his Instagram followers.

Joshua - who beat American Charles Martin to win the heavyweight title in April - faces Dominic Breazeale at The O2 on June 25 in his first defence.

And the 26-year-old posted a picture of himself in training on Friday as he gears up for the London bout.

Welcome to the KO show June 25th 😤⛓⛓

A post shared by Anthony Joshua (@anthony_joshua) on

'Welcome to the KO show June 25th,' wrote the former Olympic champion alongside a picture of himself snarling at the camera as he worked out.

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Earlier this week Joshua had paid tribute to the late Muhammad Ali, as well as admitting his fear of suffering long-term brain damage in the ring.

'Two things,' he said when asked about his fears. 'Losing all I have worked so hard for and being unable to provide for my son's future. And secondly, the effect boxing is having on my brain.

'I know if I don't look after myself I will be talking to you in a couple of years' time mumbling my words, and slurring. It won't be because I am drunk it will be the fighting, taking blow after blow to the brain.

'That scares me. I don't worry about being killed in the ring, it's losing my mind that I fear.'

Joshua also donned a t-shirt with Ali's name on the front and '1971 World heavyweight championship' - the year of the fight of the century when he lost to Joe Frazier in New York.