Out of everyone in the KarJenner family, one person has especially been a pillar of support for Rob Kardashian amid his fitness journey: Khloe Kardashian! “His mom and sisters are all supportive but Khloe is his number one cheerleader,” a Kardashian source EXCLUSIVELY tells HollywoodLife. “She’s always pushing him and checking on him and is just so proud of him.” In general, Khloe and Rob share a close bond. “They spend a lot of time together with their kids [Khloe’s daughter True Thompson, 2, and Rob’s daughter Dream Kardashian, 3] and that’s a huge motivation for him, just being the best dad he can be,” our source adds.