Bonding time! Kim and Rob Kardashian go on the 'hardest hike' ever

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The Kardashians may party hard, but they work out even harder.

That's what Rob Kardashian found out after hiking with his big sister, Kim Kardashian, on Friday.

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Kim tweeted that she "just went on the hardest hike ever today with @robkardashian."



While the two didn't share a photo from the trail, Rob did screenshot and share Kim's tweet on Instagram, captioning it, "GOOD work gurrrrrrllllll‼@kimkardashian."

Photos of Rob Kardashian from over the years:
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Bonding time! Kim and Rob Kardashian go on the 'hardest hike' ever
Rob Kardashian and Khloe Kardashian Odom from the show "Keeping Up With The Kardashians" attend an E! Network upfront event at Gotham Hall on Monday, April 30, 2012 in New York. (AP Photo/Evan Agostini)
Rob Kardashian and Khloe Kardashian (Kevork Djansezian/ Getty Images)
Rob Kardashian and Khloe Kardashian Odom from the show "Keeping Up With The Kardashians" attend an E! Network upfront event at Gotham Hall on Monday, April 30, 2012 in New York. (AP Photo/Evan Agostini)
Khloe Kardashian Odom, left, and her brother Rob Kardashian watch the first half of an NBA basketball game between the Dallas Mavericks and the New Orleans Hornets in Dallas on Saturday Jan. 7, 2012. Dallas won 96-81.(AP Photo/Mike Fuentes)
Rob Kardashian, Khloe Kardashian Odom and Lamar Odom from the show "Keeping Up With The Kardashians" attend an E! Network upfront event at Gotham Hall on Monday, April 30, 2012 in New York. (AP Photo/Evan Agostini)
ORANGE, CA - JUNE 07: Lamar Odom and Khloe Kardashian make a personal appearance for 'Unbreakable Bond' at Perfumania on June 7, 2012 in Orange, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - APRIL 23: Lamar Odom, Khloe Kardashian and Rob Kardashian attend the grand opening of RYU on April 23, 2012 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - APRIL 23: Lamar Odom, Khloe Kardashian and Rob Kardashian attend the grand opening of RYU on April 23, 2012 in New York City. (Photo by Jim Spellman/WireImage)
NEW YORK, NY - APRIL 23: Kourtney Kardashian, Khloe Kardashian, Lamar Odom and Rob Kardashian are seen on April 23, 2012 in New York City. (Photo by Alo Ceballos/FilmMagic)
LOS ANGELES, CA - APRIL 05: Khloe Kardashian (R) and Rob Kardashian visit Extra at The Grove on April 5, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
LOS ANGELES, CA - APRIL 05: Khloe Kardashian (R) and Rob Kardashian visit Extra at The Grove on April 5, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
LOS ANGELES, CA - APRIL 05: Khloe Kardashian (R) and Rob Kardashian visit Extra at The Grove on April 5, 2011 in Los Angeles, California. (Photo by Noel Vasquez/Getty Images for Extra)
Kim Kardashian, Floyd Mayweather, Khloe Kardashian and Rob Kardashian pose at Jet at The Mirage Hotel and Casino on March 18, 2011 in Las Vegas, Nevada.
LAS VEGAS, NV - MARCH 18: (L-R) Television personality Khloe Kardashian, Amercian boxer Floyd Mayweather Jr. and Rob Kardashian arrive to celebrate Rob's 24th birthday at the Jet Nightclub at The Mirage Hotel & Casino on March 18, 2011 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)
(L-R) Rob Kardashian, Kim Dsrdashian and Khloe Kardashian as NEW VEGAS Celebrates Kim Kardashian's 30th Birthday At TAO At The Venetian on October 15, 2010 in Las Vegas, Nevada.
LOS ANGELES, CA - FEBRUARY 18: (L-R) Khloe Kardashian Odom, Rob Kardashian and Lamar Odom celebrate at the 2011 BBVA NBA All-Star Celebrity Game at the Los Angeles Convention Center on February 18, 2011 in Los Angeles, California. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. (Photo by Noel Vasquez/Getty Images)
LOS ANGELES, CA - MARCH 21: Rob Kardashian is seen on March 21, 2013 in Los Angeles, California. (Photo by JB Lacroix/WireImage)
LAS VEGAS, NV - MAY 25: Rob Kardashian during his new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MAY 25: Rob Kardashian and Kris Jenner during the new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MAY 25: Rob Kardashian poses for photos with fans during his new Arthur George by Rob Kardashian sock collection unveiling at Neiman Marcus on May 25, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 15: Rob Kardashian and Kris Jenner arrive at Rob Kardashian's 26th birthday celebration at 1 OAK Nightclub at The Mirage Hotel & Casino on March 15, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian presents his Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
LAS VEGAS, NV - MARCH 16: Rob Kardashian and Kris Jenner during Rob Kardashian's Arthur George Street sock line launch at Kardashian Khaos at The Mirage Hotel & Casino on March 16, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
LAS VEGAS, NV - MARCH 15: (EXCLUSIVE COVERAGE) Rob Kardashian (R) celebrates his 26th birthday with his mom Kris Jenner (R) at 1 OAK Nightclub at The Mirage Hotel & Casino on March 15, 2013 in Las Vegas, Nevada. (Photo by Denise Truscello/WireImage)
MIAMI BEACH, FL - DECEMBER 10: Rob Kardashian presents his Arthur George Socks Collection at Neiman Marcus Bal Harbour at Neiman Marcus on December 10, 2012 in Miami Beach, Florida. (Photo by Alexander Tamargo/Getty Images)
ATLANTIC CITY, NJ - SEPTEMBER 29: Brody Jenner (L) and Rob Kardashian host The Pool After Dark at Harrah's Resort on Saturday September 29, 2012 in Atlantic City, New Jersey. (Photo by Tom Briglia/FilmMagic)
PARIS, FRANCE - SEPTEMBER 19: Kris Jenner and Rob Kardashian are seen strolling on September 19, 2012 in Paris, France. (Photo by Marc Piasecki/FilmMagic)
MANILA, PHILIPPINES - OCTOBER 27: Rob Kardashian showcases designs by Human on the runway on day five of Philippine Fashion Week Spring/Summer 2013 on October 27, 2012 in Manila, Philippines. (Photo by Jeoffrey Maitem/Getty Images)
LOS ANGELES, CA - MARCH 08: Rob Kardashian is seen at LAX on March 08, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 14: Rob Kardashian and Blac Chyna are seen at LAX on March 14, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
LOS ANGELES, CA - MARCH 25: Rob Kardashian and Blac Chyna are seen at LAX on March 25, 2016 in Los Angeles, California. (Photo by GVK/Bauer-Griffin/GC Images)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
ATLANTA, GA - MARCH 27: Blac Chyna and Rob Kardashian at Onyx Nightclub on March 27, 2016 in Atlanta, Georgia. (Photo by Prince Williams/WireImage)
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Unlike his social media maven sisters, Rob, 28, rarely posts to Instagram. In fact, he only started updating his neglected account about two weeks ago, when he shared a throwback pic of himself chowing down on a pulled pork sandwich in Malibu.

The other four posts that he's kept up (a couple have been deleted) include an adorable photo of his niece, North West, getting a big smooch her dad, Rob's brother-in-law, Kanye West, and two screenshots from the movie Miami Vice. After the hike, he captioned one of those tribute pics, "STILL MY MOOD!!!!"

Between the new posts and the time he's spending with his sisters, it looks like Rob is getting back on track.

MORE: Kendall Jenner Posts Throwback Video of a Laughing Rob Kardashian: 'This Makes Me Ridiculously Happy'

The last couple of years haven't been easy for Rob, who's kept extremely private, especially when compared to his very open siblings. In fact, his 31-year-old sister, Khloe Kardashian, recently opened up to Complex magazine about her little brother. "I call him my son as a joke," she said. "I'll call my assistant and be like, 'Did you guys ask if he wanted lunch?' or this or that and my sisters hate that I do that. I do baby him, but I'm a maternal person."

But it was especially nice to see that Kim and Rob are bonding again after past differences had split them apart for a while -- in fact, the 34-year-old pregnant reality star even called Rob's actions "pathetic" on an episode of Keeping Up With the Kardashian last season.

Yet back-and-forth tweets with Kim were actually how Rob broke his social media silence back in May -- get filled in on the conversation in the video below.

Rob Kardashian Breaks Social Media Silence, Tweets At Kim
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