Fitness & Exercise

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!!!

Josh Duhamel may look like he's on steroids -- as he says, "Look at me!" -- but it's all an illusion.

Josh was in a jokey mood Friday at LAX when our photog asked about allegations that he -- along with Mark Wahlberg and WWE star Roman Reigns -- scored steroids from now-imprisoned dealer, Richard Rodriguez.

Josh did a little flexing under his jacket and made us believe he's juicin' ... but in the end, he called BS.

Dolph Lundgren -- aka Ivan Drago -- says he's down with the dude they cast as his son in "Creed 2" ... but tells TMZ Sports he's gotta make a big cosmetic change to sell the Drago look ...

BURN OFF HIS BODY HAIR.

FYI, Romanian bodybuilder/boxer Florian "Big Nasty" Munteanu was recently introduced as Drago's spawn ... and some 'Rocky' fans were complaining since he didn't really look like his pops.

But when we spotted Dolph in the Bev Hills, he told us Big Nasty's got the bod ... and is just a painful wax-sesh away from becoming a chip off the ol' block.

"Nice wax, a little bit of hair color ... I'm sure there's a way to adjust our looks."

In a race against a horse, who'd win -- the horse or Chris Pratt?

If you guessed the horse and not the guy who plays Star-Lord in "Guardians of the Galaxy," then you're probably right -- but that didn't stop Pratt from sizing up a horse while filming an extensive workout scene Sunday in LA.

Gabi Garcia says she's got a damn good reason for missing weight in Japan ... she literally could've killed herself if she kept droppin' sweat.

"I decide not cut weight because I feeling like I almost died," said Gabi -- who insists she did NOT miss weight by 27 pounds, but rather 17.

The Brazilian MMA star told TMZ Sports about the scary events leading up to her weigh-in debacle ... saying her vision went dark once she started shedding pounds, which told her it was time to call it quits.

In a social media post, Garcia also said she suffered from gnarly headaches and bloody noses anytime she trained.

Still, Gabi feels terrible for having to scrap her fight with Shinobu Kandori ... and told us she's gonna learn from this and come back stronger.

"I accept this fight. It's my fault."

Selena Gomez and Justin Bieber were hot and sweaty for each other Wednesday afternoon, but it was likely only because of the pilates class they just left.

Fresh off a New Year's trip to Cabo San Lucas, the back-on couple looked like they needed some water leaving their West Hollywood hot pilates class after an intense workout.

They've been enjoying a much healthier and active lifestyle together since getting back together a couple of months ago. Selena's often on the sidelines watching Bieber's hockey games, but looks like they've found an activity they can do together.

Michelle Obama and daughter Malia got some extra R&R during their Hawaiian vacation by hitting up a local yoga studio.

The former First Lady Wednesday was spotted at Corepower Yoga in Kailua, Hawaii where the Obamas have been vacationing for the holidays. Michelle looks incredibly fit -- as usual -- and visibly happy. That million dollar smile says it all.

Although Malia joined her mom... there was no sign of Barack or Sasha. As for the family as a whole, splitting your time between yoga classes and the beach doesn't seem all that bad.

Namaste!

Here's hoping Elsa Hosk starts a new kettlebell trend ... with her workout attire.

The Victoria's Secret Angel suited up in a lace leotard for day 28 of LOVE Magazine's Advent calendar. Her form was on point ... and her kettlebell workout wasn't too shabby either. Elsa strapped and chalked it up for some Russian swings, single-arm rows and goblet squats. It's all fantASStic.