Mike Tyson and Roy Jones Jr. just ripped off their shirts and showed off their incredible physiques at the weigh-in for their big fight ... and man, these guys are ripped!

54-year-old Tyson and 51-year-old Roy both look amazing for their age -- really, for ANY age -- as they gear up to fight on Saturday night.

Tyson weighed in at 220.4 pounds. Jones Jr. was 210.

Both men appeared calm and focused -- and told TMZ Sports they plan on spending their Friday night relaxing and watching karate movies to get in the right headspace.

Jake Paulalso put on a show at the weigh-in -- dressing up like a Super Saiyan from "Dragon Ball Z" ... and warning his opponent Nate Robinsonto not let his kids watch the fight, because it will scar them for years to come.

36-year-old Nate is a former NBA star and 3-time NBA Slam Dunk contest champion. He said he's fighting 23-year-old Paul to prove he's still an elite athlete.

Earlier in the day, Roy Jones Jr. told us his pre-fight meal plans -- and why he's so excited to get back in the ring.

Funny moment with Mike Tyson when he was asked about his famous quote, "Everyone has a plan until they get punched in the mouth."

So, what happens when Mike gets punched in the mouth?

"We'll go to Plan B -- I'll punch him back!"

The fight is set to go down Saturday night at Staples Center in L.A. -- the weigh-in took place at a nearby hotel.

Everyone at the weigh-in site was required to undergo COVID testing -- including our TMZ photog, who was also mask'd up and keeping his distance.

As we previously reported, both Mike and 51-year-old Roy have made it abundantly clear they will be trying to take each other out from the opening bell of their 8 round exhibition (available on PPV via cable and satellite, and PPV streaming at Triller).

The event is going to be insane -- with performances from huge stars like Lil Wayne, French Montana, YG, Wiz Khalifaand more.

Ne-Yo is doing the national anthem -- and Snoop Dogg will also be involved.

Author:TMZ Staff - Source: TMZ