Fitness & Exercise

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.

It's better than any Doublemint commercial we've ever seen -- WWE's incredibly hot Bella Twins getting a stretch in Monday on an L.A. beach ... all while wearing teeny tiny bikinis.

Chew on that.

New parents Wiz Khalifa and Amber Rose have figured out how to divide their parenting chores -- he pushes, she carries.

The superstar couple -- who married this past summer -- went for a stroll yesterday in West Hollywood with their son, Sebastian, who turns 1 next month. Wiz pushed the empty stroller ... while Amber did the heavy lifting.

Amber says it took her almost a year ... but she got back to her pre-baby shape ... by working out every day.

Lookin' good.

Amanda Bynes' road to recovery includes one big cosmetic change ... removing an angelic tattoo from her body.

Amanda's been working out a ton lately -- hitting the gym and doing some power walking -- and she's also slowly erasing a pair of angel wings from her right forearm.

The tattoo -- which was prominent during her blue wig days -- is faded in recent shots of Amanda walking around her parents' neighborhood in Thousand Oaks, CA ... where she's been living since getting out of a rehab facility last month.

Your mom's Zumba class just got HARDCORE ... 'cause TMZ Sports has learned, UFC face-smasher Mark Munoz is taking up dancercise -- and we dare you to crack a joke (at least to his face).

Munoz -- who's currently ranked #7 in UFC middleweights -- hit up the LA Fit Expo on Saturday ... where he fulfilled his New Year's Resolution of (that's right) learning Zumba.

And guess what -- Mark says he loved the class so much ... he's actually considering using some of the moves in his regular MMA workout routine.

TWO MILLION butt aficionados can't be wrong ... which is why fitness model person Jen Selter has become the Internet's reigning QUEEN OF ASS!

And she'll have no trouble holding the title -- if she avoids dairy and spicy foods.

Drizzy Drake’s been on a fitness RAMPAGE … posing for shirtless pics in a Bieber-esque frenzy ever since he started dropping lbs for his new tour … and it looks like all the work is paying off.

Drake's trainer posted this latest installment on Instagram today … and he looks jacked with a noticeable four pack … and wearing an expression that says “even I’m surprised I look this good.”

No word on what inspired the new work out regimen ... but he's definitely starting to look more like Rihanna's type.

Never wanting to miss Upper Body Day, 65-pound Justin Bieber attempted a pull-up in Brazil on Tuesday -- and nearly burst every capillary in his face.

Kate Middleton allegedly had a baby 3 months ago -- but there is zero proof of that in these pics of the Duchess of Cambridge flashing her royal midriff all over a volleyball court.

Prince William's wife showed up for a public appearance in London yesterday, sporting wedge heels, and a banging bod that made everyone forget she was ever pregnant.

Kate gave birth on July 22 to Prince George ... and obviously hit the gym on July 23.

Women ... begin hating. Guys ... continue wishing you were Prince William.