Anthony Joshua knows that Joseph Parker is also pushing his body to the limit in preparation for their unification clash, says the New Zealander’s trainer Kevin Barry.

The unbeaten heavyweight champions will battle for three world titles at the Principality Stadium in Cardiff on March 31, and Joshua recently warned his rival not to ‘lay down’ in the early rounds due to a lack of fitness.

Parker has been testing his stamina during early morning runs in Las Vegas under the watchful eye of Barry, who insists Joshua is fully aware of his opponent’s dedication.

“We’re talking about two young, undefeated, hungry world champions, who are going to put everything on the line on March 31.

“We have waited a long time for this opportunity and both these guys have had each other in their sights for a long time.

“This fight has been inevitable and it’s just great that it’s come together on such a huge stage, and a fight that means so much.

“First unification fight for nearly eight years. I know that Joshua will be taking it very seriously as he always does. Joseph Parker is preparing the best he possibly can for this fight.”

Barry has suggested that Parker will use his hand speed and foot movement to negate Joshua’s power and gave a hint that he was working on the 26-year-old’s mobility this week.