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KSI's getting some last minute work in the ring before trying to bash Logan Paul's face in this weekend ... putting his skills on display in a boxing sesh and TMZ Sports has the footage.

The 25-year-old YouTube star hit the gym in Manchester, England for a public workout session in front of fans and media. We're told KSI has been training like a maniac, taking the fight very seriously.

KSI and Logan Paul will face off on August 25 -- the two have been promoting the event like crazy ... and both have dreams off launching into pro fighting careers afterward.

Logan was a star high school wrestler and placed in the Ohio state tournament his senior year. He's a real deal athlete and pro fighters have told TMZ Sports they're genuinely impressed.

KSI already has a fight under his belt -- he beat up YouTube star Joe Weller in a bout earlier this year and has been focused on training ever since.

Check out the training video -- dude's got some quick hands.

While Logan vs. KSI is the main card, their younger brothers Jake Paul and Deji are the undercard. They've been talking all sorts of crap for months ... and Jake even SLAPPED Deji during an altercation at a fan meet and greet on Wednesday.

Jake Paul just gave Deji -- the guy he's fighting in Manchester -- a Rick James welcome to his fan meet and greet ... introducing his 5 fingers to Deji's face, SLAPPIN' THE HELL OUT OF HIM!!

The slap to Deji's face all went down when KSI's little bro crashed Jake's gym ... where he was meeting up with fans for autographs and pics.

The YouTube star walked in -- talked trash -- and then had his face smacked to the moon by Logan Paul's baby bro.

"Deji showed up at my gym unannounced to try & talk shit," Jake said of the altercation.

"As soon as he walked in I slapped him in the face like the Bitch he is & then he left like a bitch..."

Lamar Odom says it's a miracle he's alive -- revealing he had 12 strokes and 6 heart attacks while he was in a coma from his 2015 drug overdose.

Th ex-NBA star spilled his guts about the incident to Kevin Hart while sitting in an ice bath for KH's YouTube show, "Cold as Balls."

"All my doctors that see me say I'm a walking miracle," Odom said while shivering in the ice tub next to Hart.

TMZ Sports broke the story ... Odom was rushed to a hospital on October 13, 2015 after he was found unconscious at Dennis Hof's Love Ranch South in Pahrump, Nevada.

Blood tests showed Odom had cocaine in his system at the time of his overdose. There were times doctors didn't think Odom would survive -- but somehow, he managed to pull through.

Since recovering, Odom has been to rehab and says he's now fully sober and over his addiction.

In fact, Odom told Kevin Hart he feels grateful to be alive -- joking about how it beats the alternative.

During the "Cold as Balls" segment, Odom also joked about the brothel and opened up about how much he appreciated Khloe Kardashian stepping up and handling his care while he was unconscious.

"It was big," Odom said about Khloe.

Odom -- who was legally married to Khloe (but separated) at the time of the overdose -- had tried to get back with her after he got better ... but she had moved on.

Jake Paul can multitask -- here he is threatening to "f**k up" Deji ... while some dude repeatedly punches him in the stomach!

Jake and Deji are just 5 days away from their boxing match in England -- an event that some say could have more viewers than Mayweather vs. McGregor.

The main event features Jake and Deji's older brothers -- Logan Paul vs. KSI -- two YouTube stars who both claim they're using this fight as a step toward becoming pro fighters.

As for Jake and Deji -- no pro aspirations here ... these guys just hate each other.

Wanna see Logan Paul throw fists at his brother, Jake Paul?? Well, better hope for a crappy Thanksgiving in the Paul household.

Logan tells TMZ Sports the ONLY way he'll step in the ring with his YouTube star little brother is if the two have "real-life" beef.

Judging by the way the two palled around when we got them at LAX this week ... don't bet on that happening any time soon.

It's too bad ... 'cause the two have been training like maniacs for their August 25 superfight with KSI and Deji -- so a Paul showdown would be must-see (YouTube) TV afterward.

Eddie Hearn -- the promoter in charge of Anthony Joshua's career -- says the fight between Logan Paul and KSI is an insult to hardcore boxing fans ... an insult he'd LOVE to promote.

Hearn basically controls boxing on the other side of the pond ... promoting not only AJ, but stars like Amir Khan, Daniel Jacobs and Tony Bellew.

Being that the fight is happening in his backyard in Manchester, we had to get Hearn's take on the event, and he told us he HATES IT and LOVES IT, all at the same time.

"How can you not congratulate them? This is a venture that's got a lot of people talking. Again, from a hardcore boxing fan's point of view, it makes my skin crawl. But, from a promoter's point of view, I have to say congratulations."

Hearn's point is clear ... he says Logan and KSI have managed to capture the interest of non-boxing fans, which Eddie says is the key to making a big splash on pay-per-view.

Jake Paul ain't just training for his superfight with YouTube star Deji by pummeling his friends in his living room boxing ring ... he tells TMZ Sports he's getting LEGIT coaching from "Sugar" Shane Mosley too!

We got the Internet sensation (and his smokin' hot GF, Erika Costell) leaving a workout with world class trainer Phil Paolina in the Valley on Monday when he revealed one of boxing's all-time greats is giving him pointers.

He says there are others in his corner as well -- including his own version of Mr. Miyagi -- all getting him ready for the Aug. 25 fight that could be bigger than McGregor-Mayweather.

Logan Paul ain't the only Paul whoopin' ass in the ring ...

Here's little bro Jake Paul beating the snot out of one his sparring partners ahead of his huge fight with KSI's little bro, Deji, on August 25.

Paul hits him with a few body shots, then a few head shots, and finishes him in a tangled mess in the ropes.

You can see Jake's big bro, Logan, watching the session from outside the ring -- and loving it.

A couple of guys who were at the house rushed over to help the sparring partner. If they REALLY wanted to help, they woulda taught him how to counterpunch.

By the way ... the ring is in Jake's living room -- 'cause he's THAT serious about winning in the YouTube stars' tilt later this month.

Remember ... TMZ Sports also got video of Logan putting a beating on his sparring partner during a training sesh back in June when he put the guy on his ass with a solid left hook.

KSI is in some SERIOUS trouble come August 25 ... so says Logan Paul's old roommate, Mark Dohner, who tells TMZ Sports he knows firsthand what the social media star is capable of doing.

Dohner -- who has more than 2 MILLION subscribers on YouTube -- says he's had his fair share of scuffles with Logan in the 2 years they lived together ... and thinks KSI's gonna be severely outmatched.

"I think physically, Logan's a beast. He's so strong, he's got reach. I would never in my life pick a fight with Logan Paul."

ICYMI -- we spoke with KSI last week ... and he said he's trying to kill Logan's ego by making 2018 the worst year of his life.

As for Logan, we've obtained video of a recent sparring sesh, and he knocked a dude straight on his ass.

Is it fight day yet??

KSI's fight with Logan Paul is set to be one of the biggest sporting events of the year ... but the British YouTuber says he's got even BIGGER plans in mind ... telling TMZ Sports he's dead set on going pro!!

We spoke with KSI -- who more than 19 MILLION subscribers on YouTube -- about the August 25 fight in Manchester, and he says he's not putting on an act ... his hatred for the Pauls is VERY real.

"I think his ego needs to be put right down." KSI says. "He thinks he's the sh*t and I'm about to f*ck him up and literally put him in his place."

"I want this year to be the worst year of his life, 100%. Pretty much, I want to squeeze every bit of relevancy from him and then move on to my bigger goal, which is to go pro."

We also asked KSI what he thought about our video of Logan knocking a dude on his ass in a recent sparring sesh ... and his response is hilarious.

Pro gaming legend Ninja says he's not going out like Antoine Walker -- telling TMZ Sports he's saving every penny of the FORTUNE he's making playing video games so he doesn't end up broke.

Ninja is considered the best Fortnite player on the planet -- and rumor has it he's making around $500k PER MONTH murdering people at Tilted Towers and Paradise Palms.

So, when we saw him out in L.A. this week, we asked what he's doing with all that cash -- and it's clear he's learned from Nic Cage's insane spending mistakes.

"We've been very smart with [our money] and just kind of saving it until we eactly know how we want to move forward," Ninja told us.

"Nothing lasts forever, and we're making sure that we're taken care of."

Post Malone is taking sides in the Logan Paul-KSI boxing match ... and Logan ain't going to like this ...

The "Better Now" rapper says he's got KSI in the superfight ... telling TMZ Sports if he had to be in one boxer's entourage for the August 25 tilt in England, he's siding with the smaller dude.

"KSI looks tough," Post says. "He's tough. He's undefeated!"

Post seems irked by the way Logan and his brother, Jake, came out for the mega-fight's press conference ... saying it all looked a lot like Conor McGregor.

Same last name ... but NO love between Logan Paul and "Breaking Bad" star Aaron Paul -- with Logan telling TMZ Sports he would beat Aaron's ass if they ever came face-to-face.

Their beef goes back a few months ... when Aaron trashed Logan for his video stunt gone wrong in the suicide forest in Japan. Aaron told Logan to "go rot in hell."

Now, Logan is firing back ... calling Aaron an "Internet bully" -- and warning the actor that if he REALLY wants a piece, he'll end up getting hurt.

Logan Paul and Chloe Bennett just made their big couple debut in public, and their fans -- okay, mostly Logan's -- were all about capturing the moment.

The YouTube star and the "Agents of S.H.I.E.L.D." star have been rumored to be an item for a while, but confirmed it Thursday when we saw them out together in Beverly Hills ... with a high five.

Check it out -- the 2 were swarmed by fans while our guy asked them questions about their relationship ... like how they're dealing with some fan disapproval, and what Chloe's favorite present from Logan is so far.

Chloe made it clear she was dating Paul Wednesday when she responded to a fan's tweet asking why she'd be with him buy saying ... "He's changed my life for the better and I've done the same for him."

Logan responded by joking he hadn't confirmed anything, but "would be an extremely lucky young man" if he had the chance to date Chloe. Clearly, he had the chance and seized it ... but he tells us he understands why some of her fans would be against dating him.

UFC welterweight champ Tyron Woodley says he's already punched his ticket to be a UFC Hall of Famer ... but when it comes to Nate Diaz, the man from Stockton ain't exactly a lock.

Woodley broke it down on "The Hollywood Beatdown" -- explaining why he deserves to join MMA greats like Chuck Liddell, Royce Gracie, Ken Shamrock and Ronda Rousey.

So, why not Nate Diaz? Tyron says his resume ain't that impressive -- and if he wants to add "HOF" next to his name, he needs to chalk up a few more MAJOR wins.

Woodley also weighed in on the Hall of Fame chances for Jon Jones, Brock Lesnar, Daniel Cormier and Nick Diaz.

There's more ... Woodley also reveals his favorite story about his old friend, Kimbo Slice, and why he's super excited for the upcoming movie about the late MMA star.

Logan Paul is adding EVEN MORE fuel to his rivalry with KSI ahead of their monster August fight ... saying straight-up the YouTube star is "my bitch!!"

Paul was out shopping on Rodeo Drive and was asked if he was ready to take on KSI in their upcoming superfight in England.

And, as has been the case at a nightclub ... on the streets of West Hollywood ... and at their news conference ... Paul took another shot at the social media superstar.

"He's my bitch -- of course."

A group of fans that had gathered to see Paul loved the comment ... and started a "Screw KSI!" chant -- which Logan just had to film.