Fitness & Exercise

Here's the latest installment of the LeBron James Challenge ... courtesy of LeBron James!!

LBJ posted yet another shirtless workout vid Friday morning ... vibin' out to Meek Mill's new "Wins & Losses" album. This time, the King raps, sings and even maniacally laughs at his haters.

LeBron's been mocked by pretty much the entire Internet -- including Steph Curry -- for his first viral gym sesh, so it's only a matter of time before your timeline gets flooded with new challenge vids.

At one point, LBJ makes sure to point out one of Meek's lyrics directed at the President -- "Trump ain't feelin' us" ... which makes sense, considering Bron's never hidden his feelings towards POTUS.

As for LeBron's singing ... it's never too late for lessons, bro.

Ryan Reynolds and Josh Brolin are ABSolutely at war now over their sick "Deadpool 2" physiques ... thanks to the guy who got Ryan in rock hard condition.

Trainer Don Saladino threw down the challenge, telling Josh ... "You still have some work to do." He attached that statement to the ridiculous photo of Ryan's blood-splattered abdominals. It's definitely a direct response to the the pic Josh posted of his chiseled features ... major abs included.

Josh has been working out like a fiend for his role as the mutant, Cable, in the 'Deadpool' sequel -- and, to us, it seems ABsurd for anyone to say he needs more "work."

Still, the gauntlet's been thrown down. So, we gotta ask?

Justin Bieber's hockey skills are getting BETTER -- the pop star hit two penalty shots on the same ice where the Kings train and we gotta say ... the stick work is pretty good.

Bieber was playing a couple of games at the LA Kings Valley Ice Center when he was tapped to take a penalty shot in 2 different games.

He faked out the goalie -- both times -- going to his backhand to put the puck in the back of the net.

With The Rock revealing that he considered a UFC career roughly 10 years ago, we wanted to know which WWE superstars have the chops to compete in a REAL mixed martial arts fight.

For the answer ... we went right to the Nature Boy Ric Flair -- who didn't even hesitate when he fired out one name, Kurt Angle.

He's probably right ... Angle famously won an Olympic gold medal for freestyle wrestling at the '96 Games after he took 1st place at the world wrestling championships in '95.

Accomplished wrestlers tend to do pretty damn well in the UFC ... Cormier, Lesnar, Jones and Velasquez to name a few.

Still, we were talking this out in the office and could all agree on one pro wrestler we woulda loved to see in the Octagon -- Andre the Giant.

Close your eyes, Clippers fans ... here's the first footage of James Harden & Chris Paul hooping together since CP3 joined the Rockets, and the guys look pretty freakin' good together.

The game went down in L.A., and Paul and Harden weren't the only NBA guys playing -- they were joined by Rockets teammate Trevor Ariza and NBA champion JaVale McGee.

It's a pretty sick video uploaded by YouBall Training honchos Thomas Scott and Anthony Davis (not that one).

Ready to call 'em a superteam yet?

James Harrison is the KING of crazy strength training videos ... but an NFL rookie might be comin' for the throne.

In the blue corner ... 39-year-old Steelers LB pushing a sled weighing OVER 1,800 POUNDS -- that's one plate for each year of his life.

In the red corner ... 22-year-old Falcons LB Duke Riley pulling an SUV weighing AT LEAST 5,500 POUNDS -- a 2017 Yukon Denali plus his buddy in the driver's seat.

James takes a few tries. Duke did his easy.

Keep in mind, though ... pushing is harder than pulling -- and Duke has wheels workin' for him too.

Demi Lovato says Conor McGregor is straight LOCO ... and his insanity is what gives him a legit shot to shock Floyd Mayweather.

"Conor's crazy! And sometimes you can't beat crazy," Demi told TMZ Sports outside Break Room 86 in L.A.'s K-Town while promoting her new single "Sorry Not Sorry."

Demi's a HUUUUGE fight fan -- she's been training at Jay Glazer's Unbreakable Gym in L.A. with some of the top fighters in the world ... and Jay says she's no joke. We've seen video. He's right.

But when it comes to the Floyd, Conor thing -- Demi says she's siding with the Irishman ... explaining that a McGregor victory would be massive for the sport she loves.

Kim Kardashian's sports bra was hanging on for dear life as she trudged up an L.A. canyon.

Kim and the girls went for a walk Thursday in Fryman Canyon near her Bel Air home. Her pal, Carla DiBello, and her personal trainer, Don-A-Matrix, were by her side, and their focus was broken just once ... to greet some adorable pooches.

As we reported, Kim and Kanye have made a deal with a surrogate for baby #3.

Odell Beckham got all sorts of love at UCLA on Thursday after an intense summer workout on the Bruins' intramural fields ... but ya gotta watch the exit, when the NFL star hops fence like a ninja warrior.

The NYG wideout spent a few hours doing some speed training down in Westwood -- and a crowd of students gathered around to watch (why not, right?!).

After the workout, Odell invited the crowd over for a massive Instagram photo sesh -- where he signed autographs, shook hands and just bro'd out with the fans.

But the best part is when it's time to leave ... and Odell decides to jump the fence with his Giants helmet on.

Dude's a freak athlete.

7:30 PM PT -- A rep for Floyd Mayweather wants to make it clear that the boxer has NO affiliation with "The Mayweather Experience."

The workouts do go down at Mayweather's gym ... but the rep says Floyd makes no money off the camp, and has absolutely no involvement in its operation.

Floyd Mayweather's private Vegas boxing gym has opened its doors for normies -- like you -- to train with Floyd's REAL boxing team ... but it ain't for the poor.

It's called "The Mayweather Experience" -- and for $650 a pop, regular people will get their hands wrapped by Floyd's guys, step into Floyd's ring and hit the mitts with Floyd's dad, Mayweather Sr.

It's essentially a 2-hour fantasy camp for Mayweather-aholics to see if they can make it through TBE's legendary grueling workouts.

Got rich friends? Mayweather's gym is offering training camp packages for groups -- a 6-some will run you $3,500.

We're told Floyd's team has been offering the workout for about a month so far and it's been going great.

Not too late for Conor to sign up ...

Beast Mode ain't playing around about this NFL comeback -- running crazy footwork drills IN THE SAND with a legendary footspeed specialist ... and it's scary good.

Marshawn Lynch hit the beach with Luis Badillo Jr. -- who's said to have the fastest feet in the world. He's trained world class athletes like Cristiano Ronaldo, Asafa Powell and tons of NFL players.

This time, he flew up to the Bay Area to put in some work with the Oakland Raiders star -- and it's clear these dudes ain't messin' around.

Floyd Mayweather admits he's not the same dominating boxer he was 20 years ago -- or even 5 years ago -- but he's still gonna beat that ass.

The 40-year-old boxer hit the gym Wednesday night to put in some more training time for Conor McGregor -- and posted video of his workout.

He included the caption, "I know I'm not the same fighter I was 20 years ago, I'm not the same fighter I was 10 years ago... As a matter of fact, I'm not the same fighter I was 5 years ago."

"I'm just an old legend putting in work in 16 oz gloves."

Floyd has broken down the shift in his fighting style for TMZ Sports before -- and says he went from knockout artist to defensive-minded boxer to protect his hands.

It worked.

Arnold Schwarzenegger's son has his priorities straight ... hit the gym before ya talk Hollywood!

Joseph Baena was out Wednesday in Malibu -- near his Pepperdine campus -- when our photog wanted to know if he'd follow in his father's footsteps. Our guy even tossed up a softball: if he could reboot one of his dad's old movies, which one would it be?

Gotta hand it to Joseph ... for not only entertaining the question but also sticking to what's working for him -- pumping iron like his pops.

Joseph also gets in plenty of cardio with his bros ... Pepperdine style, of course.

Some people eat tubs of ice cream after a break-up but Gregg Sulkin's therapy seems to be planks and pull-ups, which he did Thursday morning at an L.A. park ... with impressive results.

To be fair, the "Teen Wolf" star and Bella Thorne split last summer. It looked like they were back on after her botched trip to Cannes with Scott Disick, but it appears she went crawling back to the Lord.

As for Gregg, he should have zero problems finding a new chick with those abs, arms, pecs, smile ... you get the picture.

French fitness blogger Rebecca Burger died after a whipped cream can exploded onto her chest ... according to her family.

Rebecca, who was popular on Instagram, was killed last weekend in a totally bizarre accident. Her family says the pressurized canister blew up, hit her chest and triggered a heart attack.

The hit reportedly sent her into cardiac arrest, which ultimately led to her death.

The family also posted a pic of a whipped cream canister with a warning about using similar products. They claim "thousands" of defective ones are still in circulation.

Rebecca was 33.

Michelle Obama is continuing to move her body even after leaving the White House, and it looks like these days she could take anyone down in arm wrestling.

The former First Lady posted a series of pics from a boot camp over the weekend in Washington D.C. where she and Barack have been living since leaving the White House.

Michelle says the intense workout session is a tradition she started while in the White House and looks like it's still going strong, especially when it comes to her upper body.

One thing's for sure, Michelle and Barack are looking better than ever since leaving the White House.