Hollywood and WWE superstar Dwayne The Rock Johnson has revealed footage of the intense training regime he is undertaking for his lead role in A24s The Smashing Machine. Now well-known for his affinity in both the gym and the ring, his role in the biographical drama will see the action star outside his comfort zone both in acting terms and, more surprisingly, in the ring, as Johnson becomes mixed martial artist and two-time UFC heavyweight champion Mark Kerr.