FLOYD MAYWEATHER sparred a 21-year-old for eight rounds and took NO breaks in between, Claressa Shields revealed.
The women's boxing champion held an open workout in Mayweather's Las Vegas gym to promote her next fight.
And beforehand she watched the American legend in action, and was left convinced he is still as unbeatable as ever.
Shields, 26, said: "Floyd's in great shape. He was sparring a 21-year-old for eight rounds and he wasn't even always taking breaks between rounds.
"He can still do whatever he wants to do inside that ring. If he wanted to, he'd give all those guys problems at 147 and 154.
"From what I saw, his legs and his motor are still working."
Mayweather, 44, is due to watch Shields in action against Ema Kozin, 23, on Saturday in Cardiff.
It comes with the former five-weight world champion increasing the intensity of his comeback training.
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Although Mayweather officially retired in 2017 after beating Conor McGregor, 33, exhibition comeback have kept him in the ring.
Most recently, he was taken the distance by YouTuber Logan Paul, 26, but did give away TWO STONE in weight.
Mayweather confirmed he will fight again on February 20 on top of the the Burj Al Arab Jumeirah's HELIPAD in Dubai.
Vlogging sensation Money Kicks – real name Rashed Belhasa – had revealed he was in talks to be the opponent.
Mayweather has been training for his latest return in Miami and Las Vegas, under new head coach Gerald Tucker, who also trains Shields.
Boxer Jhon Ingram sparred with the 50-0 icon and revealed Mayweather still trains 'like he is in his 20s'.
Floyd's in great shape. He was sparring a 21-year-old for eight rounds and he wasn't even always taking breaks between rounds.
Ingram told Fight Hype: "His gameplan and his knowledge in the game is unbelievable, he was throwing things I have never seen before.
"His defence is amazing so I had to throw big punches to actually hit him.
"He definitely still lives up to his name. I was thinking because he is a little older now that I would be able to push him.
"But he still moves like he is 20. He punches like he is still in his 20s. His awareness and reactions are still like he is in his 20s.
"Even if he took a real fight right now I don't see anybody beating him, if you look at a lot of great fighters after they retired it's a lot different to Floyd.
"He is still training and keeping his boxing IQ up."
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