Danica Patrick's become a devout follower of yoga ... and she's making us devout fans of her following yoga.

The Arnold Schwarzenegger and J.J. Watt bromance is HEATING UP -- with the two meeting up for a late-night gym sesh ... to blast out a few squats?!

Of course, the Houston Texans star struck up a friendship with Ahnold at the CMT Awards in Nashville last month -- and clearly, they've kept in touch.

So, with J.J. in L.A. -- it appears Arnold invited Watt back to his home gym ... where, according to Schwarzenegger, he challenged Watt to do 50 reps on his squat machine.

The result??

"He did 51. After dinner," Arnold said ... "Watch out, quarterbacks."

#BestBuds

Question -- How is Magic Johnson like Jesus?

Answer -- They both walk on water.

Check out Magic Johnson working out in his treadmill ... while on his YACHT ... off the coast of France.

Who says cheerleaders aren't athletes?!!

Check out this video of Houston Texans cheerleader Daranesha busting out a pretty INSANE ab workout during a team gym session ... while hanging off a heavy bag!

It's the same workout Dallas Cowboys superstar Dez Bryant busts out when he's trying to get his stomach right ... and trust us, it's not easy.

By the way, on her official Texans bio video, Daranesha says she mostly stays in shape by dancing around the house all day.

Yeah right.

#Beast.

This is adding insult to alleged felony -- Diddy’s kettlebell arrest is now being mocked by workout fiends ... who are using his alleged weapon of choice to get in shape and get laughs.

The day after he got arrested ... “The Diddy Workout” instantly became a thing for gym rats ... who've taken to grabbing kettlebells, doing a few reps and belting out Diddy's catchphrase ... “take that, take that.” It's as ridiculous looking as it sounds.

Based on social media, trainers are picking up on the craze ... adding the "Workout" to classes.

So, Diddy's bust is a silver lining for muscle heads. Still totally sucks for Diddy.

Ray Rice is clearly expecting to return to the NFL -- training every single day at an exclusive athletic facility in Connecticut ... TMZ Sports has learned.

The former Baltimore Ravens running back is a regular at the BlueStreak Sports Training Center in Stamford, CT ... and we're told he's been impressive with speed and footwork drills.

We're told Rice has been at the center for the past "few months."

Rice is eligible to play in the NFL again after serving his suspension for the domestic violence incident -- but the question now ... is there a team that will actually take a chance on Rice?

Stay tuned ...

Hey ... you ... guy or girl with sorta-muscles -- STOP TAKING PICS OF YOURSELF IN THE FRICKIN' GYM ... 'cause it's pissing off Mr. Olympia.

With the gym-selfie craze going global, reigning body building champ Phil Heath says he CAN'T STAND when people stop their lift to shoot themselves in the middle of a workout.

"It's pretty annoying ... they should be in there killing it, you know?!"

Check out the clip -- Heath says you should be concentrating on blowing up your muscles ... and not your stupid timeline.

Listen to him ... he's bigger than you.

You know when people tell you to "push it" in the gym?

More proof Shaq is really REALLY strong ... he just did a full set of seated rows at the gym using all of the weight on the machine .... PLUS AN ENTIRE CHRIS WEBBER.

The two former NBA stars and current TNT employees hit the gym together in Cleveland ... where Shaq decided to show off a little bit.

Check out the clip ... Shaq says he's going to lift C-Webb "instead of take shots" -- which could be a reference to the drama involving Webber and his old Fab Five teammates.

FYI -- Webber has been going back and forth with Jalen Rose stemming from a rift over a documentary about their legendary college hoops days at Michigan. Maybe Shaq was suggesting they worked it out already.

Check out 20 pics of the sexy star hitting the trails while you try not to feel bad about not getting off your couch alllllllllll weekend!

Dear Barack Obama ... DO NOT PISS OFF YOUR WIFE!!!

Check out this new footage of Michelle Obama going to town on a punching bag at the White House gym -- throwing punch combinations and a pretty devastating roundhouse kick!!

FLOTUS was showing off her Top 5 workout moves to celebrate the 5th anniversary of her Let's Move! campaign -- which is supposed to motivate Americans to get off their asses and get fit.

Michelle looks great in the video ... jumping rope, hitting squats and blasting her core.

#BringOnRondaRousey!

Memba Shawn Oakman -- that GIANT mountain of a college football player who became an Internet meme last year???

Well, he's back ... hitting a 40" box jump WHILE HOLDING 70 POUND DUMBBELLS IN EACH HAND!!!

TMZ Sports obtained footage of Baylor's famous 6'9" 280 pound defensive end getting in some hardcore strength training in Vegas -- and it's pretty impressive.

Oakman hit up the exclusive Athletic Gaines training center on Tuesday -- and worked out with Travelle Gaines, who's trained some of the best athletes in the world ... including Reggie Bush, Andrew Luck, Marshawn Lynch and LeSean McCoy.

We're told Oakman began the training session with light weights ... and moved up ... with Shawn capping out with the 70 pounds dumbbells.

Oakman will be a senior at Baylor next year ... and some experts think he could be the #1 overall pick.

Keep your eye on this dude.

Mama June is joining a band ... in her lap.

The 'Honey Boo Boo' matriarch is so inspired by her recent 45 lb. weight loss, she's gunning to lose another 50, with the help of the Lap-Band.

We did the math ... she currently weighs in at 276 lbs., and if she achieves her gastric goal she'll go down to a svelte 226.

June made the decision to go under the knife because she's plateaued with her trainer and her relatively healthy diet.

She'll have the surgery this summer, which means she'll just miss bikini season.

Cristiano Ronaldo's 4-year-old son is already taking after his father ... working on his abs during a father/son training session ... and it's friggin' adorable.

The kid -- Cristiano Ronaldo Jr. -- started off by holding his dad's feet while the soccer star ripped off a set of crunches.

Then the tables turned ... with dad pushing his kid to knock out a solid 10 sit-ups ... which he does without a problem!

Tim McGraw ... talk about country strong.

Guests at the Hotel Del Coronado near San Diego were stunned when a semi-exposed and hairless Tim put on a gun show before performing at his own show later that night.

The country star -- who turns 48 today -- credits his godly physique to the Paleo diet and CrossFit.

Bravo fitness star Greg Plitt allegedly made a handshake deal with a filmmaker to create his popular fitness show, but never paid the guy ... who's now going after Greg's estate to get the cash.

According to docs ... filmmaker Devin Coury says he and Plitt had an oral contract for his online "Raw Series" back in 2009. Coury says he shot the footage for the program, and was owed $50,000 for his services.

Of course, Plitt died last year when he was hit by a train -- but Coury says he never got a dime of the 50 large. In the docs, Coury says he saw Plitt one last time in 2013, and got his word he would make things right ... but that never happened.

As for proof there was really a deal -- Coury's submitted invoices he sent to Greg.

Coury admits trying to get the money from his dead friend's estate is a "fragile situation" -- but he's pressing forward with his claim.