Kim Kardashian West may have been tough on her brother Rob Kardashian over the past few years, but this time, she is using her toughness to get through their joint workouts. The pregnant star has recently been speaking up about getting sweaty with her reclusive brother.

Kim shared a tweet Monday saying that she is working out with her younger brother. Earlier this month, she also opened up about going on a tough hike with him.

The siblings have been motivating each other both in person and in social media. In response to Kim’s tweet about the hike, Rob said: “GOOD work gurrrrrrllllll‼️@kimkardashian.”

Rob also gave a shout out to his younger sister Kylie Jenner, whom he spotted getting her own workout done with rumored boyfriend Tyga. He shared a photo of the pair on Instagram and said that he ran into them while on the morning workout.

It is a good sign that Rob has been joining Kim as she works to stay fit and healthy during her pregnancy. Rob has had some major fitness issues in the past couple of years. His mom Kris Jenner was quoted in an episode of “Keeping Up With the Kardashians” saying that he gained over a hundred lbs. in the span of only a year.

Kim also faced weight issues when she was first pregnant with her now two-year-old daughter North West. It appears that she has a better handle of her health for her second pregnancy and she is getting her brother involved as well.

While on vacation in the island of St. Barts last week, Rob did not join the rest of the Kardashian-Jenner clan, so Kim went on a hike with her mom. She also kept her fitness regimen by working out by the beach with her sisters, Kourtney and Khloe Kardashian.