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Blac Chyna, Rob Kardashian, Snapchat

Snapchat

Blac Chyna and Rob Kardashian are staying healthy!

The couple, who are expecting their first child together, had quite the outdoorsy day Tuesday when they decided to grill some lunch and hit the trails. Rob and Blac hosted a barbecue for lunch, where they grilled chicken and vegetable skewers, hot dogs and corn. The Lashed salon owner posted photos and videos on Snapchat, where viewers could see Rob was playing chef for the day.

The day didn't end with a BBQ, though! Blac and Rob decided to work off their meal by going for a hike. In the videos fans can hear them both panting, which means they definitely got in a good workout! Rob even joked that his two water bottles were free weights that he could use for a little strength training.

Blac Chyna, Rob Kardashian, Snapchat

Snapchat

Even though the mom-to-be has made it perfectly clear she isn't too worried about pregnancy weight gain, she does want to be supportive of Rob while he continues his weight loss journey. The Keeping Up With the Kardashians star posts snaps and healthy eating tips, and just last month Rob underwent a 21-day no-sugar challenge. Throughout her Snapchat videos she often gives her husband-to-be some words of encouragement.

The future Mrs. Kardashian, however, is looking to gain a lot of weight this pregnancy (she's already mom to King Cairo, whom she shares with Tyga). "My goal is to gain like 100 pounds this pregnancy," she admitted into the camera. "I'm going to tear it up and then I'm going to snap back."

Blac Chyna, Rob Kardashian, Snapchat

Snapchat

She has been sharing her weight with followers, and most recently revealed she's up to 165 pounds. Although she occasionally gives in to some unhealthy cravings, Blac mostly eats healthy foods, which include kale salads, sautéed salmon, scrambled eggs and even Cornish hens.

After marinating and grilling both hens, she snapped the finish product and then her clean plate, exclaiming, "This is how I feel about this...YUM!"

Rob & Chyna (working title), a six-episode docu-series following the parents-to-be and their whirlwind romance, will premiere on E! later this year.