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Ruiz Jr hasn't fought since losing his world titles to Joshua in Saudi Arabia back in December 2019.
But the Mexican-American star is set to return to action next month and ahead of his ring return, he has taken to social media to reveal his massive quads.
The 31-year-old shared an image of himself, accompanied with the motivational caption: "Work work work the only way for success," while tagging his new head coach Eddy Reynoso.
Reynoso has definitely not allowed him to skip leg day judging by the picture as he prepares for his highly-anticipated comeback.
"Eddy Reynoso is bringing a championship stable. Whenever you have Andy Ruiz training with hungry fighters like Ryan Garcia, Frank Sanchez, and of course, Canelo Alvarez, it rubs off," he said.
"You train around greatness then you become greater. Not only does Eddy Reynoso have the power to tweak certain fighters but he can do it in a matter where you don't need fast feet.
"Alvarez has flat feet, Garcia has flat feet, but they all have explosive hands and they have the fighting I.Q.
"They know how to fight and they have heart. I love this fight. Chris Arreola has only lost to champions and he's always in entertaining fights."
Mora added: "I don't know what the impact of Eddy Reynoso will be. Reynoso has had most of his success with smaller weight fighters.
"I'm curious what Reynoso is going to be able to do with a heavyweight like Andy Ruiz.
"He doesn't have great footwork. He does have fast hands and is a skilled guy but I don't know what Team Reynoso is going to be able to enhance."
Ruiz Jr (33-2) vs. Chris Arreola (38-6-1) is set to headline a Premier Boxing Champions card on April 24.
Featured Image Credit: Andy Ruiz Jr
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