Fitness & Exercise

Justin Bieber is in a race to the bottom ... but at least now he's got some attractive company.

Bieber took a 1-on-1 hike with his model friend, Ashley Moore, who seemed down to get physical with him in a friendly competition running on a canyon trail.

If there's one thing we know about Bieber ... he tends to open up in the wilderness. Bodes well for Ashley. Plus they've hung out before -- couple years ago at a Clippers game -- so, seems like they've got a connection.

Jackie Warner's face was flush right after she was arrested for backing her vehicle into a cop car.

TMZ obtained the fitness queen's mug shot -- taken after the L.A. County Sheriff's Dept. took her into custody Friday night in West Hollywood.

We broke the story ... Warner crashed her car into a pole. A deputy on scene had to jump out of the way when she allegedly threw her car into reverse without warning.

Conor McGregor has been hitting the boxing gym with an Irish boxing sensation -- who tells TMZ Sports the UFC star is 100% confident the fight with Floyd Mayweather will actually take place.

We spoke with 25-year-old Michael Conlan -- who won an Olympic bronze medal for Ireland in 2012. Conlan says he became friends with McGregor a while back and the two have been tight ever since.

In fact, Conlan says McGregor has agreed to carry the Irish flag when Conlan walks to the ring during his upcoming pro fighting debut on St. Patrick's Day at Madison Square Garden.

In the meantime, both Conlan and Conor have been training together at an L.A. boxing gym -- as recently captured by TheMacLife.com.

We asked Conlan how McGregor's boxing training is going -- one thing's clear ... he's definitely impressed.

Michelle Obama put her legs -- and possibly those of her Secret Service agent -- through the paces Sunday in Washington, DC.

We got Michelle on her way out of SoulCycle. Looked like she had a decent workout, but check out the agent covering her. No dark suit and shades on this guy ... and based on his gear, we'd say he got in some cycle time too.

Our DC sources say Michelle and her Secret Service agents used to get private classes, but now she spins with the public.

Greg Hardy's training MMA at an elite gym in Florida ... but how does he look, and is he any good?

Now we know ... 'cause TMZ Sports has exclusive video of a Friday afternoon training sesh at American Top Team ... AND an interview with his training partner, Antonio "Bigfoot" Silva.

We asked "Bigfoot" Silva -- once one of the best UFC heavyweights -- about the prospects of his sparring partner making it at MMA's highest level ... the UFC.

Silva says don't be surprised if Hardy's fighting inside the Octagon within a year or two.

As for Hardy's kickboxing coach, Steve Bruno, the guy holding the mitt and pad while Greg works on combos -- jabs, crosses, knees, kicks -- he broke down the former Pro-Bowler's upcoming training schedule.

This is amazing ...

UCLA superstar Lonzo Ball accepted a dunk-off challenge from a fellow Bruin student ... and it ended with a KILL SHOT!!

It's great video -- non-collegiate athlete Kevin Wei (who's studying for his degree in Applied Mathematics/Computer Science) went to Pauley Pavilion for the 1-on-1 dunk-off.

Wei actually managed to DUNK ON BALL (yeah, it's a lowered rim but still!) -- and that's when Ball decided to exact some hardcore revenge with a windmill powerdunk.

R.I.P. Kevin Wei.

(But really ... props on the insanely cool video).

Looks like Kevin Love is off to a great post-surgery recovery on his left knee ... because the Cleveland Cavs star was already walking around the streets of NYC last night and TMZ Sports has the video.

Love underwent arthroscopic surgery on Tuesday in NYC where a doctor removed loose bodies from the knee. He's expected to be out around 6 weeks.

But Wednesday night, he was already moving pretty well on his way out of a Ralph Lauren fashion show with his girlfriend, Kate Bock.

It's great news for Cavs fans and Polo fans ... 'cause the collection looked dope!

WWE superstar Big Show has a message for Shaq -- a big, giant sweaty message -- GET READY TO GET YOUR ASS KICKED AT WRESTLEMANIA!!

Big Show has been training for their big showdown at WrestleMania 33 in April -- after months of smack talk.

Now, Big Show is showing off his progress with a gym pic and a message mocking Shaq who's been spotted at an Oreo cookie event recently and lip-synching on Instagram.

"@Shaq! Karaoke? Doughnuts? You better get serious. All roads lead to @WrestleMania. The only giant!"

You know what this means? SHAQ'S GOTTA SELFIE BACK!

If ever a video was gonna make you get up and get your lazy ass to the gym, it's this one ... 81-year-old golf legend Gary Player burning up a treadmill with all the AARP swag in the universe.

Player is notorious for his fountain of youth fitness habits, and even posed nude in ESPN The Magazine's Body issue at 77 ... but we gotta say, this might be even more impressive.

Look, is he Usain Bolt? No. Is he going harder than we do? HELL YEAH!!!

Who's got the balls to talk trash to LeBron James???? (besides Charles Barkley) ... how about the GREATEST competitor in the history of "The Challenge!!!"

TMZ Sports spoke with 'Challenge' legend Johnny Bananas ... who's DOMINATED on the MTV show for years ... and he strongly believes LeBron wouldn't stand a chance in his world.

FYI, "The Challenge" is a bunch of hot dudes and chicks who party their faces off and sometimes bang each other at night ... and then go to war in grueling physical competitions during the day. New season premieres tonight.

It's crazy ... these people are legit athletes.

So, we asked Johnny how a world-class physical specimen like LeBron would hold up. He ain't too confident in the King.

Beware, NBA forwards ... you might have a 6'9", 300 lb problem ... 'cause TMZ Sports has video of Glen "Big Baby" Davis putting in some serious work in hopes of making an NBA comeback.

Davis hasn't been in the league since the 2014-15 season ... but he wants back in -- and we've got footage of the guy busting his ass at the Sports Academy in Thousand Oaks, CA.

We're told Davis has been training at the S.A. 5-6 days a week -- working with a full team of specialists focusing on strength and endurance. He's also got a nutritionist and a "mindset development guru."

How do you like your Jason Momoa ... blonde or brunette??

Now you have choices, thanks to NFL stud defensive end Bryan Braman -- who says he gets mistaken for the jacked up actor EVERY DAY!

Braman -- who's about to be a free agent -- says he loves the comparison and says he's even down to be Momoa's official stuntman ... 'cause he's down to do all the dangerous stuff.

But who's got the better abs? Braman states his case.

He also gives us a man bun tutorial on the street -- and one thing's clear ... dude's got BEAUTIFUL HAIR!!!

The new Mr. Clean can't rest now that he's scored the iconic role -- instead he's got serious work to do in the gym.

We got Mike Jackson in Houston where his new employer's hooking him up with 2 Super Bowl tix. As they say, nothing's free though because Mike strongly hints he's been told to pump things up. He looks pretty big in this video, but insists he can't match the OG Mr. Clean just yet.

As for the best music to clean to -- Mike's fave is a classic, but he's saving his dance moves for Super Bowl Sunday.

For the record ... we think he's off on the size thing.

Senator John Thune revealed to our photog ... the only place on Capitol Hill where Democrats and Republicans can put aside their differences is in the Senate weight room.

We got the South Dakota Republican at Reagan National Airport Monday and he vouched for NY Senator Chuck Schumer, saying his tears were real because he's an emotional guy, even at the gym.

That opened the door to talking about the super exclusive Senate gym, and who knew this is where political enemies lay down their differences.

And if you believe him, the weights are mislabeled ... because in D.C. it's all about power!!!

The U.S. Air Force wants to join the indoor cycling craze ... and they're looking for a super good spinner to lead the cardio charge.

According to docs obtained by TMZ ... the Air Force is revamping its Fitness and Sports Program. The brass wants to hire instructors for spin classes at Patrick Air Force Base in Florida.

The Base will hire a contractor to provide the backdrop for a good spin session, and they'll then install the necessary equipment, including a sound system.

Classes will be held on Tuesday and Thursday -- 2 a day throughout 2017. They will range in length from 45-60 minutes.

According to the specs, instructors must supply their own batteries for their headsets.

Lily Collins will take a Friday 6-pack to go from the gym -- but we all get to enjoy.

Phil's daughter left the gym in Bev Hills and looked like she got in a major workout.