People.com Celebrity Parents Mandy Moore Pumps While Climbing Mountain 5 Months After Birth: 'New Realities of Adventuring' Mandy Moore, who summited Mount Kilimanjaro prior to welcoming her baby boy Gus, says she is "happy to be back at it" By Benjamin VanHoose Benjamin VanHoose Twitter Benjamin VanHoose is an Associate Editor on the Movies team at PEOPLE. He's worked at PEOPLE for over three years as a writer and reporter across our Entertainment, Lifestyle and News teams, covering everything from the Johnny Depp v. Amber Heard trial to the Oscars. He regularly covers red carpet events and has interviewed stars like Drew Barrymore, Ryan Reynolds and Kirsten Dunst. He previously worked as a copy editor at Topix Media Lab. People Editorial Guidelines Published on July 21, 2021 01:08 PM Share Tweet Pin Email Mandy Moore is reaching new heights as a new mom. The This Is Us star, 37, shared photos on her Instagram Story Tuesday documenting a recent mountain-climbing expedition she completed with friends at Washington's Mount Baker. The journey comes five months after Moore welcomed her first baby, son August "Gus" Harrison with husband Taylor Goldsmith. "We made it. On the summit at 6:30 this am. More to come. Never been this tired. And I have an infant," she wrote on one slide, giving a thumbs up while in a helmet and all her gear. Moore also shared photos of herself pumping breastmilk along the way with portable Medela pumps. She wrote on one selfie that it was her "new realities of adventuring," and added another smiling photo of herself pumping on the mountain's summit. "Happy to be back at it," she wrote on another slide. Want to get the biggest stories from PEOPLE every weekday? Subscribe to our new podcast, PEOPLE Every Day, to get the essential celebrity, entertainment and human interest news stories Monday through Friday. Mandy Moore Instagram RELATED: Mandy Moore Thanks Doula 'Friend for Life' Who Helped with Newborn Son Gus: 'It Takes a Village' In April, the singer/actress showcased her first postpartum workout on Instagram after being granted the all-clear to start exercising again post-birth. "Later call at work + finally cleared to start slowly exercising + @kathrynbudig x @kiragraceyoga collab? Best day!!" Moore posted on her Instagram Story, along with a boomerang of her in the new gear. In another post, Moore thanked Budig, a yoga instructor and author, for the outfit and said she's working toward a new exercise goal. "Thank you for sending my way, @kathrynbudig! You and my new exercise gear!! Mama is training to climb a mountain again so let's do it!!!" Mandy Moore Instagram Moore is an avid hiker, and has summited Mount Kilimanjaro and reached base camp at Mount Everest before Gus' arrival. She previously told PEOPLE that the idea of doing Kilimanjaro is what pushed her to take her hiking to the next level. "I've always been a hiker — I lived near Griffith Park in Los Angeles for almost 15 years, so it was just in my backyard, practically. But I always wanted to climb Kilimanjaro and that's what sort of solidified my love of being outside and realizing that I can tackle something that was seemingly impossible," she said in February 2019. "I'd never camped before, so the idea of being outside for a week, not showering — all these new experiences — I sort of proved to myself that I was capable of more than I was giving myself credit for." Mandy Moore Instagram For Father's Day last month, Moore praised Goldsmith and touted his parenting abilities. "Let's face it," she wrote in her tribute, "I'm pretty sure you were always destined to be a dad. You've written songs about coaching little league for goodness sakes….But watching you step into this role with so much confidence and ease and patience and adoration for our sweet guy just astounds me and has made me fall deeper in love than I ever thought possible." "Every silly face you pull, book you've read, record you've introduced him, bath time splashes and tummy time smiles you effortlessly elicit… all of it is so much fun to bear witness to," she continued. "Gus and I are so truly lucky to be on this journey of life with you. Love you the most and Happy Father's Day."