Andy Ruiz Jr Shows Off Remarkable Body Transformation After Weighing 20 Stone For Anthony Joshua Fight

And his weight proved costly as he cut a sluggish figure on fight night, surrendering his world titles.

But Ruiz Jr has shown off a remarkable body transformation ahead of his ring return.

He's uploaded a few training clips on social media and the former world champion looks in great shape.

Needless to say, Ruiz Jr's new physique sent social media wild.

"Think you should go down to cruiserweight you will dominate," one Twitter user joked.

A second wrote: "Look about 4-5 stone lighter!"

A third added: "Dang, you looking slimmer. Keep up the good work, bro."

Ruiz Jr will have Canelo Alvarez's coach Eddy Reynoso in his corner for his next fight as he eyes the likes of Luis Ortiz and Dominic Breazeale.

Speaking about the highly-ranked Brit, he said: "I'd like to fight Dillian Whyte, and I'd like to shut him up.

"That would be an amazing fight in the United States or over there.

"I know I can win. I feel like I can win against Everybody, but it's just up to me."