Anthony Joshua has been training for a month with chubby fighters like Andy Ruiz - Joshua's manager

Eddie Hearn has revealed Anthony Joshua is sparring 'chubby fighters' in a bid to prepare himself best for Andy Ruiz Jnr - the only man to have beaten him in a professional ring.

Joshua is in the midst of his 12-week training camp and is working towards avenging his shock defeat in the money-spinning December 7 rematch with Ruiz in Saudi Arabia.

The Brit was criticized or not preparing accordingly for Ruiz, a shorter and plumper heavyweight than he's previously faced, following the upset in New York earlier this year, but Hearn has insisted his approach this time is much more specific to the Mexican's style.