Fitness & Exercise

Colin Kaepernick wants everyone to know he's still NFL ready ... and he's showing off his rocket arm during a training session in Houston.

Kaepernick hit the field with Josh Hidalgo -- Head of Sports Performance at William Paterson University -- and threw some darts with a team of pass catchers.

Hidalgo says he's been training Kaep every single day since January 2017 -- adding, "We haven't stopped throwing, training and preparing."

"To say he's dedicated is an understatement ... Even when we’re traveling we put in that work."

Kaepernick hasn't taken a snap in the NFL since 2016 -- before he parted ways with the San Francisco 49ers.

Kaep has said he wants to get back in the league and compete for a starting job again -- and now he wants the world to see he's still got the talent that took him to the Super Bowl.

"Don't sleep on Floyd Mayweather" when it comes to MMA ... because the guy can REALLY wrestle -- so says Floyd's hired muscle.

We spoke with Floyd's personal private security force -- Jizzy Mack and Greg La Rosa -- and asked them how their boss is prepping for his MMA debut.

The guys say they haven't seen Floyd training with UFC welterweight champ Tyron Woodley yet -- but acknowledge "he's a beast" and would definitely be the man to get Floyd UFC-ready.

But, the most interesting part ... both guys claim Floyd has legit ground skills.

"Floyd's tough all around ... he can wrestle."

These guys spend MOST of their lives right by Floyd's side -- from traveling to the gym -- and they would know how Floyd's been training for his rumored transition into MMA.

As for Tyron, he says he's spoken with Floyd and agreed to train him -- and even spelled out how his training camp would go on "The Hollywood Beatdown."

Get ready to throw away your Girl Scout cookies, normies ... 'cause Sylvester Stallone's out here muscling 100-POUND WEIGHTS in his private gym -- and crushin' it like Rocky in his prime!!

Hard to believe, but Sly's already 71 years old ... but that hasn't slowed down his workout routine, clearly.

Regular pull-ups (or chin-ups if you're a workout nut) ain't enough for the senior Italian Stallion ... so, he strapped the weight of a small human around his waist and LETARIP!!!

What's even more shocking ... Sly captioned the vid -- "Another easy workout! You’re only as old as you and your joints feel!"

Not as savage as the 1-armed pull-ups ... but pretty damn impressive.

Bellator MMA star Justin Wren says he just suffered the worst physical beating of his life -- but it didn't go down inside a cage!

Justin's fought 15 heavyweight behemoths in his career, but tells TMZ Sports none of those beatdowns come close to what Mount Kilimanjaro did to him a few weeks ago.

In case you missed it, "The Big Pygmy" scaled the near-20,000-foot mountain with Super Bowl champ Chris Long and some of his NFL bros ... all to raise awareness for the water crisis in Africa.

Wren says that at one point, they had to climb for 20 HOURS STRAIGHT ... and some of their crew were forced to tap out (don't worry, they were stretched down).

But the coolest part of the trek -- Wren says he signed his new Bellator contract at Kili's summit!

Ya gotta hear the play-by-play ...

LeBron better start knucklin' up ... 'cause the baller he's been beefin' with is getting boxing lessons from a UFC superstar!!

That superstar is former middleweight champ Chris Weidman -- who came through Knicks practice on Wednesday to chill with his hometown hoops squad ... including Bron's trash-talkin' rival, Enes Kanter.

Weidman shot around with Enes -- but it looks like they had more fun strappin' on the gloves to get the Turkish big man ready for a potential throwdown with the King.

"Hey @kingjames, I've been training my guy @eneskanter11. Best think twice before messing with the Orange and Blue again," Chris tweeted at LeBron.

FYI, Kanter called LBJ a "queen" and a "princess" after they got in each other's faces in November ... and trolled him after a game last month, too.

Stipe Miocic is from Cleveland, Bron -- might be time to reach out.

Joe Jonas tried to take a stand in Australia -- on his surfboard -- and he eventually got there ... for about 2 seconds.

The DNCE singer went out looking to ride some waves at Bondi Beach Friday, but even with the help of a surfing instructor ... he couldn't quite get his body moves to sync up.

You gotta admire the Jonas bro's determination, though -- he kept hopping back up on his board even after eating it several times, and it finally paid off ...

PyeongChang's Olympic village is hook-up central for alpine skiers ... who are hitting the dating app, Bumble, as hard as they hit the slopes.

Bumble says most competitors -- from all countries, not just the U.S. -- have seen a 50% spike in swipes since the games started a little over a week ago. Translation: someone's gotta help you "stretch" on your off days, right?

That mostly applies to athletes who love going downhill -- Bumble says the alpine skiers are getting more hook-up action than their fellow Olympians. According to the app ... hockey players rank second, freestyle skiers and cross-country skiers tie for third. Snowboarders and ski jumpers bring up the rear.

Ya won't get crucial stats like that on NBC!

Olympic luger Chris Mazdzer's historic silver-medal finish didn't just come with one of those cute plush white tigers ... it came with a buttload of dirty messages, since his win also made him a big heartthrob.

Mazdzer became the first U.S. men’s singles luge medalist ever and says he can't keep up with the way his phone's been blowing up, mostly with congratulatory DMs ... but some want him to take it off.

The Olympic Village is known for being a Tinder-friendly international hook-up zone, and Chris says the layout makes it super convenient.

Team USA athletes have made their way across the world to South Korea, and they're all geared up to hit the ice and snow ... to bring home some hardware!

Lindsey Vonn (with her doggo, Lucy), Shaun White, Alex Shibutani and Sam Michener are among the 244 athletes on the U.S. Team in PyeongChang for today's Opening Ceremony of the Winter Olympics.

Vonn's favored to win her women's downhill skiing event, Chen is USA's great figure skating hope ... and everyone knows what "The Flying Tomato" can do in the half-pipe.

2 Chainz wants to destroy Snoop Dogg at their NBA All-Star weekend celebrity game -- so, he's hired the guy who trains Joel Embiid and Dwight Howard to get him ready for the showdown.

The man in charge of Tity Boi's game is Drew Hanlen -- a self-described "NBA strategic skills coach and consultant" who's insane client list also includes Bradley Beal, Jayson Tatum, Kelly Oubre and more.

Don't get it twisted ... Tity Boi is a LEGIT athlete -- he played college basketball at Alabama State -- but after spending months in a wheelchair with a broken leg, he's called in the big guns to make sure he's ready for Snoop.

Judging by the training video, Chainz looks good -- showing off his handles, making it rain from 3, and even talking a little trash.

Impressed, Snoop?

Nick Jonas has been benched from the bench, because he hurt himself bad during a late night workout.

Nick had just performed in Mexico Monday night, and after the concert he hit the gym, which for him is like religion. Something bad happened, because he posted this pic showing a bandaged left hand.

He doesn't say what happened, but it has clearly sidelined him. When you time out the concert, it seems he hit the gym sometime after midnight.

Lucky he was able to take comfort in a bottle of Coors Light.

Kourtney Kardashian was holding on to her dear life in NYC ... her dear life named Penelope.

Kourtney's mommy & me day with Penelope in Central Park Sunday also included North West. They skated to "Redbone" by Childish Gambino and then took a walk under some light rain. It was quite the escape from L.A. where it was a steamy 81 degrees.

Kourtney's really getting the hang of this ice skating thing. But more than that, she's totally nailing the part of kool mommy and fun auntie.

Screw cake by the ocean -- Joe Jonas is getting into shape by the pool before his big wedding ... and it looks like his workouts are in full swing.

Joe was seen getting his Russian kettlebell swing on Wednesday at the Bondi Icebergs Pool near Sydney, Australia -- where he seemed to be working up quite a sweat.

After his exercise, he hopped into the famous pool for a dip.

As we reported ... Joe asked girlfriend Sophie Turner to marry him this past October, and she said yes. However, a wedding date has yet to be announced.

As if us average bros need more reasons to be jealous of Chris Pratt ... here he is lockin' up with UFC Hall of Famer Randy Couture at Jay Glazer's MMA gym -- and holding his own!

So, why didn't Couture ragdoll the "Guardians" star like an MMA wannabe?

1) Pratt was actually a stud wrestler back in the day, and 2) Pratt says Couture took it "very easy" on him.

Fun fact: this was actually a reunion! Chris says Randy coached him at a college wrestling camp 21 years ago, and he still remembers it like it was yesterday.

"He invited teenage me to come up and demonstrate the three throws we’d learned that day ... it was such an honor."

Jen Selter brings out the thirst in all of us -- which is fitting ... 'cause it looks like she's a little thirsty herself.

The famous fitness model was seen poolside in Miami drinking from what appears to be some sort of fancy drink from a giant wine glass -- with lots of straws to suck from.

Verne Troyer ain't messing around when it comes to his 2018 #FitnessGoals ... CRUSHING the weight room with NFL prospect Du'Vonta Lampkin!

Verne gives up 300 POUNDS to Du'Vonta ... but he did a damn good job keeping up with the former Oklahoma defensive tackle out at Sports Academy in Newbury Park -- flippin' tires and reppin' barbells like a regular frat bro.

Mini-Me got teamed up with one of the largest human beings in the draft thanks to Vayner Sports ... and we're glad they did.

Get it, Verne!!!