Rob Kardashian and Blac. Picture: AFP

Rob Kardashian's daughter Dream is his "motivation" for getting fit.

The 'Keeping Up With The Kardashians' star – who has three-month-old Dream Renée with Blac Chyna – took to Instagram to reveal he is inspired to stay active and drop the pounds by his little girl.

Sharing a series of posts from the gym, he wrote: "Got it in with @gunnarfitness ... Green juice time ... woohoo.... and this weather is perfect ... greeeeeeen (kale, spinach, romaine, parsley, cucumber, celery, apple, lemon, ginger) movieeeee (sic)"

Shortly after his workout session, he shared a couple of pictures of his daughter, captioning them: "This is my inspiration ... This is my motivation. (sic)"

Meanwhile, Rob is said to be feeling "really positive" following his split from Chyna.

This is my inspiration.

A post shared by ROBERT KARDASHIAN (@robkardashian) on

A source said: "Rob had been staying at Kris' house with the baby while Chyna was out of town and Kris was helping him with the baby. He's in a really positive mood again.

"Everything was moving so fast with the relationship, the baby, the engagement and the show that this break has been really good for both of them. Now that they've had space, we'll see if they end up getting back together, but for now, they are still happily separated. They are both much happier and in a better place right now."

And despite going their separate ways, the pair still want to continue with their reality show 'Rob and Chyna'.

The insider added: "The show is still set to tape, and they will make it more about their struggles and breaking up. There are no wedding plans as of now, but then again, those two are always on and off."

The former couple are now working hard to "co-parent the best they can".

A source shared: "They are doing the best they can to stay civil and to co-parent the best they can. They have worked out an informal custody arrangement. They found out what works for them and they're doing a good job at it.

"[Rob and Chyna] realise Dream will connect them for life, and it's not worth it for them to fight and get dramatic about their breakup. They're forever connected by that beautiful girl, so there can't be any bad blood."

Bang Showbiz