Fitness & Exercise

MMA legend Chael Sonnen says Ronda Rousey should DEFINITELY take Floyd Mayweather's offer and work with the boxing legend on her striking ... cause hey, she might actually learn something!

As we previously reported, Mayweather says he's down to help Ronda out if she'd give him a chance ... despite the fact they've publicly feuded for years.

Sonnen joined the guys on the "TMZ Sports" TV show (airs Tuesday night on FS1) and explained why Ronda should forget the war and get in the ring with Floyd.

He does issue this warning ... just because Floyd's a great boxer doesn't mean he'll be a great coach.

But hell, at this point it couldn't hurt.

Just HOURS after crushing the KC Chiefs' Super Bowl dreams ... 38-year-old James Harrison was back in the gym -- getting ready for New England.

The guy is an absolute maniac ... busting out speed drills, power squats and back work.

By the way, Steelers coach Mike Tomlin (in a Facebook video streamed from the locker room) had estimated the Steelers jet wouldn't even land until 4 AM!!!!

We'll have whatever Nick Jonas is having inside the gym -- dude walked in looking all JoBro, but walked out full Adonis.

Nick proudly showed off his ripped bod post-workout ... looking like a billboard for Jay Glazer's Unbreakable Performance Center in West Hollywood.

That hoodie had to work overtime to conceal those guns.

Britney Spears' BF, Sam Ashgari, barely broke a sweat lifting weights at Muscle Beach, but the same might not go for people breezing through photos of his intense workout.

Sam, who appeared in Brit's "Slumber Party" video, hit the famed open-air weight room in Venice Friday afternoon with his actor pal, Sam Jones III.

Jon Jones says Ronda Rousey isn't some washed-up bum just because she lost ... she's still a beast and should STRONGLY consider fighting again.

We spoke with the UFC superstar moments ago who says it's easy to pinpoint where Ronda went wrong -- Holly Holm laid out the blueprint to beat her and she needs to evolve as a fighter.

As for her future, Jon says it's important for Ronda's legacy that she get back in the Octagon and do what she does best ... because she can still win.

He ditched the drugs ... he ditched the lean ... and now Gucci Mane is 'bout a different kind of life -- CYCLING!

The 36-year-old rap superstar has picked up the sport as part of his new, healthy lifestyle -- and he's even got the Lance Armstrong-style outfit to match.

Gucci famously battled with weed and sizzurp before he went to prison -- and now that he's out, he's vowed to stay clean.

Today is day one with the bike ... and he doesn't look half bad.

Here's 67-year-old Ric Flair totally crapping on your New Year's resolution ... showing he's stronger than you'll EVER BE ... by deadlifting what appears to be 400 lbs (we counted it up, 4 plates on each side).

Nature Boy added a caption to the video -- "I.Will.Never.Retire."

Maria Sharapova might be in the middle of her 15 month suspension for doping but she's still dope.

Maria enjoyed a little R&R on the island of Lanai over the New Year and, judging by her rock hard body in that tiny black bikini, she's been keeping up with her tennis training.

Ronda Rousey's biggest sponsor is reaffirming its support for the UFC star ... even after her big loss at UFC 207 ... with Reebok telling TMZ Sports the company "stands with Ronda 100%."

Ronda signed an individual deal with the athletic wear company in 2014 -- when she was at the top of her game. Now, after 2 devastating losses in a row, we asked if she was in danger of being dropped.

Meghan Markle continued her Prince-free holiday this week without Harry ... but did sub in her mom for some quality downward dog time.

Paps got Meghan out in Toronto Tuesday morning making her way to a yoga class with mama bear Doria Radlan in tow.

SoulCycle is being sued by a woman who says she was pushed so hard during one of their classes she had to be hospitalized.

Kaila Cashman says she signed up in 2014 for her very first indoor cycling class at SoulCycle's Rye Brook, NY location. During her workout she claims the instructor repeatedly increased the torque on her bike, and told her to keep pedaling. Not that uncommon for a SoulCycle sesh, if you've ever been.

Kaila says after the workout she felt sick and went to the hospital, where she was diagnosed with rhabdomyolysis -- a condition that leads to the rapid breakdown of muscle tissue.

Terrell Owens might be 43 but it's hard to tell from his hoops game ... 'cause judging by this video TMZ Sports got of him ballin' in L.A., the guy still has it.

T.O. was balling up at the Sports Academy in Thousand Oaks, and showed flashes of the athleticism that's gonna make him an NFL Hall Of Famer one day (seriously guys, put the man in).

Peep the clip ... T.O. calmly drains a three off a sick assist from the guard ... then darts up the court and straight Mutombos a shot from a guy who obviously hasn't read his scouting report.

Odell Beckham, Jr.'s cousin isn't on an NFL team right now ... but that hasn't stopped him from making incredible highlights, 'cause Terron Beckham literally went head over heels for his newest workout video.

Not only is he squatting (495), deadlifting (495) and benching (405) a ton of weight ... he can land a nice backflip that would make Simone Biles proud.

Terron made headlines when he tried out for the New York Jets before the 2016 season ... and although he didn't make the squad, it's cool to see him still reppin' the Green and White.

Here's Ronda Rousey's badass comeback "Rocky" style montage -- complete with grueling workout sessions, full-speed wind sprints ... and a sick look at her mansion in the hills.

It's all part of the new promo for UFC 207 on Dec. 30 in Vegas -- and the message is clear ... Ronda has heard all the doubters and haters and CAN'T WAIT to prove 'em all wrong.

She's your problem now, Amanda Nunes.

The bodybuilder who slapped the hell out of a judge during a competition in Greece has been BANNED FOR LIFE ... by the biggest bodybuilding organization in the world ... TMZ Sports has learned.

As we previously reported, Giannis Magos -- aka Ioannis Magkos -- attacked one of the judges after losing the Diamond Cup during a competition in Athens on Nov. 27.

Now, the IFBB is slapping back -- delivering a "life expulsion" to Magos ... which is a big deal, considering the organization is connected to the biggest events in the sport ... including Mr. Olympia and the Arnold Classic.

Talk about determination ...

Lindsey Vonn broke her arm just over 2 weeks ago ... and she's already back in the gym working out like the freak athlete she is.

Vonn fractured her humerus while training in Copper, Colorado ... but it's hard to tell in the video she just posted on Instagram.

The world-class skier provided an update Wednesday, proving that she's not gonna let a broken arm keep her from getting in a few pull ups.