Justin Bieber Shares Sexy Shirtless Gym Workout, Hiking Day, Says ‘#StayFit’

Justin Bieber has pretty boy swag sewn up. But, in case some haven’t noticed, the pop prince can also do manly, sweaty, have-you-seen-my-epic-core-strength in the gym — and hiking too.

Justin Bieber has core strength for days, according to an Instagram of him in a gym posted this weekend.

On Sunday, the Biebs shared a peek at his intense workout on his social media pages. The 20-year-old posted an Instagram of himself performing a leg lift on a dip bar.

Justin’s caption read:

“#ogr what a solid core. Lol #stayfit #dontbescared @thepatricknilsson,” a reference to his trainer, Patrick Nilsson.

Mindful of motivating his fans, the 20-year-old posted the gym glimpse on Twitter with the hashtag, “#stayfit.”

The Swedish instructor met the singer in February 2012 through Bieber’s manager Scooter Braun. The pair also traveled together on and off the Believe tour, and the training continues.

As a result, long gone is the underweight kid of yesteryear, and it’s all down to the Biebs putting in arduous gym hours and days under his trainer’s guidance who has transformed Justin’s once ridiculed body into a ripped, toned physical specimen of pop/R&B superstar-ness.

“My goal was always for him to have a Marky Mark–type body: big but not too big.” Patrick told In Touch last November.

Of Bieber, he said: “I can’t keep him out of the gym! There are periods where he wants to work out seven days a week.”

The fitness guru recalled the Canadian wasn’t lifting weights or “really eating much” when they began working together, adding:

“It wasn’t until last November that he was really pushing to get bigger and got motivated to work out harder” Nilsson told the magazine, adding, “He said to me one day, ‘Man, I never want to be skinny again!’”

And it’s clear Justin loves his new sculpted body, going by his oft-shirtless state.

On Sunday, Justin posted two shirtless snaps of himself, captioning both, “prettyboyswag.”

The nex day, the singer and his crew’s fitness drive continued with a hiking trip in Runyon Canyon. The area is a scenic fave with hikers in Los Angeles and bordered to the east by the Santa Monica Mountains.

Bieber posted one Instagram snap of himself — shirtless naturally — with Nilsson and his bodyguards at the top of one of hike trails in the canyon.

“We made it #ogr #orangegymrats #dontbescared,” Bieber penned the note to the image.

Shortly after, a Shots close-up went up.

Nilsson posted the same photo, writing alongside it:” Crushed Runyon canyon #beasts #ogr.”

Other posts by some of the crew showed one male and two female hiker that Justin’s party met in the canyon as well as landscape shots.

Are the Biebs’ fitness posts attempts to make on-again, off-again girlfriend Selena Gomez jealous, or keep current gal pal Yovanna Ventura excited?

Bieber and Gomez are supposedly locked in a super-intense social media duel, involving posting snaps of themselves with new dates: 18-year-old, model Yovanna Ventura for the Biebs, and 26-year-old male model Tanz Watson for Selena.

E! News reports that a source didn’t deny that’s a possibility, saying: “They are kids. Of course they might try to do that.”

My uncle took a selfie with @justinbieber on the beach #lmfao #hahaha pic.twitter.com/7YKuvpyJQw

— Mariah (@mariahraskin) July 15, 2014

But, the next comment by the insider also downplayed any nastiness to it, adding:

“There will forever be an emotional connection for them, but they don’t have a title to their relationship. He is not her boyfriend, but the feelings are always going to be there.”

“Selena is happy and is having a great time with friends in New York City. She is trying to move on with her life and focus on her.”

Meanwhile, Justin is getting buffer and is clearly raring to get his summer on. After a day in the mountains, the singer was spotted darting out of DBA nightclub in West Hollywood last night with his crew.