Fitness & Exercise

There was a major Secret Service breach this week in Poland ... because someone was able to sneak video of President Barack Obama working out at the gym ... and it's not pretty.

Obama, who is in Poland to rally Eastern European support against Russian aggression, was filmed working out in a hotel in Warsaw ... and somehow whoever took the video managed to do so without being made by Secret Service.

The workout is a little scattered -- some arms, some legs, some shoulders -- and his form could use some work.

Rob Kardashian plowed his SUV through a crowd of aggressive paparazzi -- none of whom work for TMZ -- as he exited an L.A. gym Thursday ... and you could clearly hear his car make contact with at least one of the shooters.

The situation was a mess from the beginning -- the photogs were gathered right in front of the exit driveway and forced Rob to make a decision ... stop and be shot ... or GO. GO. GO.

He went with Option 2.

The photogs refused to move at first, playing a game of chicken with the SUV -- only getting out of the way when it was clear Rob had no intentions of slowing down. Still, they hammered Rob with questions about Kim's wedding and his weight issues.

Fitness guru Cara Castronuova isn't very discriminating ... she'll go on a date with ANYONE who's willing to pay the asking price -- $10,000.

Cara -- an ex-trainer on "The Biggest Loser" -- tells TMZ she's raising money for her charity -- Knockout Obesity -- by offering a romantic evening in NYC with anyone who ponies up 10 grand.

The best part ... she's open to men and women.

Cara says she hopes to go on at least 3 dates so she can send 50 overweight kids to fat camp. She's moved by the heartbreaking letters she gets ... including one from a boy who told her he desperately wants to shed lbs so other kids will stop pinching his stomach.

So what do you get for your money? Cara says the date consists of dinner at a really nice place and then seeing the new Rocky musical on Broadway.

But here's the deal ... you have to pick up the tab for dinner ... and pay your own way to NYC. She'll take care of the theater tix.

Gerard Butler looks ready to do battle with Xerxes again, flashing his buff bod on Sydney's Bondi Beach yesterday.

THIS ... IS ... Atkins? Jenny Craig? More gym, less lunch?

Nikki Reed ditched her wedding ring and tucked her head between her legs Saturday in Los Angeles ... just a day after announcing her divorce.

Reed hit up a yoga studio yesterday in Los Angeles and seemed to be in a pretty somber mood -- makes sense, her and "American Idol" star Paul McDonald just ended their marriage.

The couple says they're still working on an album together ... but they've been living separately for the past 6 months.

Don't expect Megan Fox to wear mom jeans after popping out another kid last month ... because she already lost all the baby weight -- in 5 freaking weeks!

Fox ran some errands Friday in Los Angeles with her other son Noah -- after giving birth to Bodhi Ransom in February -- and one thing is clear, girl was looking GOOD.

Jillian Michaels and her crew got an unexpected surprise on her tour bus Sunday ... wild turkey.

Sadly it wasn't the fine bourbon ... it was a dead bird.

A turkey large enough to feed the entire "Sister Wives" group for Thanksgiving smashed into the bus windshield so ferociously ... it shattered the glass and went tumbling inside.

No humans were injured in the accident.

Jillian was travelling from Nashville to West Virginia giving motivational speeches on her "Maximize Your Life" tour.

Justin Bieber had his ass up in the air during his short stint in jail ... impressively doing 23 1/2 pushups in 28 seconds.

The jailhouse video -- obtained by TMZ -- shows Justin in his cell after being busted last month in Miami Beach for DUI and resisting arrest.

It's unclear what possessed him to show off his physical prowess, but he seemed excited about upping his cred.

The feud that divided the Eagles is officially OVER .... so says Terrell Owens who tells TMZ Sports he's buried the hatchet with Donovan McNabb ... ten years after they were at each other's throats.

T.O. was out in Venice to shoot a promo for a piece of workout equipment called "The Rack" -- dude's still frickin' ripped btw -- when we asked about the beef with his old QB.

FYI -- McNabb and Owens hated each other back in the day ... and famously went after each other in the media after losing the Super Bowl.

But the beef has been dying down in recent years ... and McNabb even considered attending an event that honored Owens in Philly earlier this month.

Despite the olive branch, T.O. couldn't help himself from taking one last shot at D.M. ... and it's all over soup. Check out the clip.

Jen Selter -- fitness model turned ass Internet sensation -- tells TMZ Sports ... she LOVES when famous athletes and celebs reach out to her about her butt 'cause "it makes me feel special in a way."

Selter and her bulbous derriere were hittin' the streets of NYC when we talked about how her 'donk has exploded on Instagram ... with more than 2.5 million followers ... many of whom are bigtime stars.

"It's cool when talent reaches out to me ... 'cause it's like, I feel special in a way."

Also included in this clip:

-- How many squats Jen does per day
-- Who's got the best butt in Hollywood

The end.

"Biggest Loser" trainer Dolvett Quince still isn't happy with winner Rachel Frederickson's weight -- after she dropped from 260 to a scary 105 pounds -- but he tells TMZ, he's determined to get her healthy.

Rachel won Season 15 earlier this month ... but her dramatic weight loss shocked viewers, who claimed Rachel had lost TOO much weight, bordering on anorexic-looking.

And it appears Quince agrees -- he tells us, "We're going to get her healthy. She's going to be alright ... She's getting healthier every day."

Quince says he's still working with Rachel -- pro bono -- and has a plan to help her get better.

Nicole Murphy and the chicks from "Hollywood Exes" found a way to make the Hawaiian coastline even more luscious ... with a very hot yoga session on the water.

The exes -- Nicole, Andrea Kelly, Sheree Fletcher, Mayte Garcia and new cast member Shanna Moakler -- traded yoga pants for bikinis ... balancing on all four in the water on paddleboards.

Julianne caught some So. Cal. rays with Washington Capitals center Brooks Laich. With photogs in plain sight they clearly wanted to make a statement as they walked with her teeny tiny dogs.

It's not like Ryan Seacrest will be heartbroken. He's moved on with another hot chick, who apparently is cool that he sees other people as well. In other words, don't feel sorry for him.

Fatness often plagues NFL players after they retire -- but former lineman Alan Faneca tells TMZ Sports he's helping his old teammates win the battle against obesity .... just like he did.

Faneca -- who played 13 NFL seasons while weighing 320 lbs -- has dropped all the way to 213 lbs ... and ran a full marathon in UNDER 4 HOURS this past weekend.

"There's no reason to be 320 and be walking around post-football," Faneca says ... noting that he made the decision to shed the weight after considering the long-term health issues that have plagued NFL big men in the past.

And now that he's successfully slimmed down, Alan says he's passing along his weight loss secrets to some of his old friends from the Steelers, Jets and Cardinals.

"I have had some buddies reach out that have had trouble and struggled," Alan said while appearing on the "TMZ Sports" TV show ... explaining, "If you dont make that transtiton kind of quick, all of the sudden that 320 turns into an ugly 350."

Ke$ha's music producer Dr. Luke is in serious danger, according to the LAPD, after some of the singer's fans went nuclear -- blaming Luke for her eating disorder.

LAPD's Threat Management Unit filed legal docs -- obtained by TMZ -- asking for a search warrant to hunt down the identity of people who are threatening Luke's life on Twitter.

The vengeful tweets started after TMZ ran a story that Ke$ha entered rehab for an eating disorder because Luke taunted her about her weight. Ke$ha's friend told us ... Luke told her she "looks like a f**king refrigerator."

In the search warrant docs, cops point out some of the tweets, including:

-- "You need to be worried because IMA slit your throat before January is over."
-- "You ugly fat ass bum bitch. Im gonna carve u like a pumpkin with a long sharp knife."
-- "Im gonna gut you like a fish then skin you and glue ur wrinkly raisin skin to a fridge!"
-- "I'm gonna slit your F**KIN throat open then gouge your eyeballs out."

Aaron Eckhart pumped up his 45-year-old physique by lifting weights on the beach in Santa Monica yesterday, and showed off his rock hard ... abs.

The bulging actor sported some unfortunately clingy swim trunks during the workout session ... nearly overshadowing his scar free bod.

Aaron reportedly busted his ass in the gym for 6 months to get in fighting shape to play 200-year-old Adam in the new film "I, Frankenstein."

Nice build.