Over the weekend, Moore reached base camp and rejoiced, while also describing the struggles of such a feat.

\"There is so much magic in these mountains,\" she wrote Saturday. \"They represent adventure in the grandest form and in a language all their own. Traversing this terrain has its challenges. Breathing at altitude, for instance, is not easy. One of the greatest gifts/lessons that Melissa simultaneously bestowed on us during this trek was the fine art of pressure breathing.\"

The \"This Is Us\" star, 35, added that this feat is something she'll carry always, especially back in the states, if she's having a rough day.

\"Besides hydration and staying nourished, breathing is THE vital key in the fight against altitude sickness,\" she wrote. \"It’s also a major takeaway that I will be employing back to the real world whether I’m in the midst of a tough workout or a weird day. Mind blown.\"

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I went into this Everest viewing trek relatively blind. Not unprepared, mind you...but I wanted to venture forward into the unknown with an open mind and heart and as free of expectations as possible. I also knew we were in extraordinary hands with our friend/ @eddiebauer alpine guide and Everest extraordinaire @melissaarnot (she’s summited 6 times and guided the Basecamp trek between 35-40 times so this isn’t her first rodeo). Once we arrived in Kathmandu and had our de-brief about what the next 10 days of our life we’re going to look like, it became abundantly clear that this experience was going to be one of physical discomfort, personal challenge AND fundamental spiritual growth. Sign me up. We also decided as a group to refer to our trip as a Everest viewing trek incase our plans deviated from the original goal of making it to base camp, placing greater importance on the journey and not the destination. In addition to living out this bucket list dream, being gently placed in this middle of this extraordinary country of Nepal and bearing witness to the customs and culture of the Sherpa people has been spellbinding. So much to take in, in every way. 3 days in, I’m writing this from 11,500 feet, tucked away in the terraced village of Namche (also known as the Sherpa center of the Khumbu Valley) as transparent clouds of mist seem to obscure our view of the hustle and bustle below and then just as quickly, glide away to reveal the towering peaks of Kongde Ri and Kwande La. We’ve been acclimatizing here for the past 2 days, taking on some day treks to help prepare our bodies and breath for the travels ahead. Not sure what awaits us on the road today but this group is in it all together (with all the snacks and milk tea one could ever want)! Stay tuned.... #whyihike #ebpartner

A post shared by Mandy Moore (@mandymooremm) on May 22, 2019 at 7:43pm PDT

Moore also opened up about the emotion of such an accomplishment, something so few people have experienced.

\"It’s impossible to be lucky enough to arrive at the foot of these mammoth peaks and not be attuned to the palpable energy of all of those who came before and lost their lives in these mountains,\" she wrote. \"The wave of emotion: respect, reverence, appreciation....that washed over us as we took in the prayer flags and yellow domed tents of base camp AND sat on the rocks regarding the chortens that dot the hillside of the Tukla Pass the day before, profoundly.\"

Finally, she followed up her base camp announcement with a lengthy, thoughtful post a few hours later trying to sum up the trip.

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There’s no way to distill this experience down to a few sentences. There’s no way to encapsulate what coursed through our veins and brains living in the mountains this past week. It will come in time. I think I’m slowly learning that I feel most like me when I’m outdoors. It’s couldn’t be any more outside my every day realm and yet there’s something entirely refreshing about being tasked with nothing more than breathing and slowly putting one foot in front of the other. One thing I know for certain is that this trip was what it was thanks in large part to the company. Being able to adventure alongside those you love deeply (@streicherhair, @chaseweideman, @thejendaltonshow) and new friends alike (@starfire_reid, @julianapse, @tyler__reid, @sherpatseringdolker), is an absolute gamechanger. We shared everything: laughs, toilet paper, snacks, skincare, the silly songs that got stuck in our heads, milk tea, selfies, the “happy naturals”, etc.... all the makings of a quality trip to the most remarkable place any of us have ever been. I’m also left inspired by the collective perseverance this group had to help each other every step of the way and to watch as we all met this shared goal of reaching base camp together is something I’ll never forget. Thank you to our friends at @eddiebauer for making this happen! And to the true MVP of this trek, @melissaarnot: thank you for sharing such a substantial piece of yourself and this second home of yours with us. It’s every bit as magical as you described: Your expertise, your stories, your wisdom, your belief in us.... set the tone for this entire experience.... The funny thing is, Melissa kept mentioning this idea of meditating and making goals while we were in the midst of the “pain cave”. It’s easy to daydream and make big plans when you’re down at sea level but it’s a much taller order to do it while in the grips of something truly difficult. Message received. I dug deep while in the midst of all of those pressure breaths and made a mental list of things that scared me but I was anxious to tackle. Now that I’m back on solid ground, I can’t wait to home and get to it. #whyihike #ebpartner

A post shared by Mandy Moore (@mandymooremm) on May 29, 2019 at 12:27am PDT

\"There’s no way to encapsulate what coursed through our veins and brains living in the mountains this past week,\" she began in Sunday's post. \"It will come in time. I think I’m slowly learning that I feel most like me when I’m outdoors. It’s couldn’t be any more outside my every day realm.\"

But she also talked about how this trip inspired her to try other things that may have scared her in the past.

\"I dug deep while in the midst of all of those pressure breaths and made a mental list of things that scared me but I was anxious to tackle,\" she added.

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