Andy Ruiz Jr sent the boxing fraternity into shockwaves in June with his sensational victory against heavyweight rival Anthony Joshua.
The 30-year-old dropped Joshua four times before stopping him in the seventh round at Madison Square Garden.
The rivals will go head-to-head again in Saudi Arabia on December 7 in one of the most eagerly-awaited fights of the year, as Brit Joshua bids to win back his belts.
Ruiz Jr has undergone a dramatic body transformation since that dramatic victory – looking far leaner and in much better condition to when he last fought AJ.
There has been some suggestions that Ruiz Jr’s weight loss would lead to him struggling in the rematch against Joshua, but recent footage very much suggests otherwise.
Ruiz posted a video on Instagram of himself hitting pads with his trainer accompanying him, with the caption: “I barely touched him.”
In the clip, Ruiz Jr throws a powerful left hook which accidentally catches his trainer and sends him staggering backwards.
A concerned Ruiz Jr then walks towards the coach who signals he is OK, before being embraced with a hug by the champion.
The experienced fighter, who fought Joshua in June at just six weeks’ notice and was labelled ‘chubby’ by promoter, Eddie Hearn, says he plans to make the best use of his speed by trimming down.
“Right now, I’m only three pounds less than when I fought Anthony Joshua,” he said.
“A lot of people are saying ‘he looks too skinny, he won’t be strong enough for the fight’, but those are people who don’t really know about boxing.
“I just want to be 6lbs, 8lbs lighter than I was on June 1. That’s the goal, to be 8lbs lighter, and that’s going to make me feel a lot better.
“It’s going to make me a lot slicker, a lot faster, and that’s going to tell on December 7.”