'I'm going to hospital' - The Rock was forced to spar Oleksandr Usyk for real and names one thing that stunned him

Dwayne Johnson experienced first hand what makes Oleksandr Usyk so tough when filming 'The Smashing Machine' .

In the upcoming release, the actor, better known to sports fans as The Rock, stars opposite Emily Blunt to tell the story of legendary MMA fighter, Mark Kerr, and his ex-wife, Dawn Staples.

As the highs and lows of Kerr's career are shown, some familiar faces make an appearance alongside the duo.

This includes the undisputed heavyweight champion of the world, Usyk, who plays Igor Vovchanchyn.

In 1999, Vovchanchyn became was the first man to be declared a winner against the seemingly unstoppable Kerr, although the decision was later overturned to a no contest.

The Rock, a WWE legend and still athletic at 53 years old having bulked for the role by putting 30Ibs of muscle on,