Harvard evolutionary biologist Dan Lieberman is the scientist whose work reshaped how we understand running. His research on human evolution helped popularize the idea that we’re born to run, that our bodies, from our toes and tendons to our oversized glutes, are uniquely adapted for endurance. In this conversation, he joins Zoë and Brendan to explore what running reveals about being human.

We dig into why ultrarunning is evolutionarily bizarre but still deeply natural, what persistence hunting really looked like, and how belly fat, treadmills-as-torture-devices, and even the barefoot craze all tie into our running story. It’s part science lesson, part reminder that while we didn’t evolve for nipple tape, running is still one of the most human things we do.

Thanks to LMNT for supporting The Trailhead!

Joe Grant has always blurred the lines between athlete and artist. From racing UTMB and Hardrock to biking between Colorado 14ers, Joe’s career has evolved into something bigger than competition—projects that fuse endurance, place, and creativity. In this conversation, Joe joins hosts Zoë Rom and Brendan Leonard to talk about his journey from racing to FKTs to local San Juan projects, why he ditched the watch, and how he balances gear geekery with poetry and film photography.

If you’ve ever wondered how running can fuel creative work—or vice versa—this episode goes deep into what it means to truly be present on the trail.

Thanks to Running Warehouse for sponsoring The Trailhead!

And check out the Best Day Ever Ultra, register now to reserve your spot!

👉 Subscribe to The Trailhead wherever you get your podcasts.
📺 Watch full episodes on YouTube.
🎧 Check out other shows on the UltraSignup Podcast Network:

• The Buzz with Buzz Burrell — grounded takes on the big ideas shaping trail and ultrarunning.

• Between Two Pines — conversations that connect trail running with culture, community, and the outdoors.

This week on The Trailhead, Zoë Rom and Brendan Leonard sit down with one of ultrarunning’s most quietly legendary figures: Junko Kazukawa. A two-time Leadwoman, breast cancer survivor, and one of the few athletes to complete both the Grand Slam of Ultrarunning and the Leadwoman series in a single year, Junko’s story is a masterclass in resilience and joy.

Born in Sapporo, Japan, and now based in Denver, Junko shares how she started running in the U.S. after coming over as a student, how she trained through cancer treatments, and why she still lines up for 100- and 200-mile races at age 62. She talks about the identity and community she’s built through the sport, how her view of fitness has evolved over decades, and why she believes “glutes are everything.”

We also hear about her favorite races around the world, from the Tour de Géants to Mount Fuji, and what keeps her motivated to take on new challenges even as recovery gets harder with age. Whether you’re chasing your first ultra or your 26th, Junko’s joy and perspective will make you want to lace up and keep going.

Thanks to Running Warehouse for supporting The Trailhead. Check out their great selection of everything from shoes to nutrition, packs and socks, with free two-day shipping.

Register now for the Antelope Canyon Ultras! These desert classics always sell out, get your spot now!

Take our listener survey! It takes just five minutes, and your input helps shape the future of UltraSignup! Take it here: https://docs.google.com/forms/d/e/1FAIpQLSeCgLdj8-92G_pLDxkPfuJ0-r477MzZPieRx_qlj1cmP2oybA/viewform?usp=header

This week on The Trailhead, Zoë and Brendan sit down with writer, runner, and trail storyteller Sarah Lavender Smith. Sarah has been chronicling the culture of trail and ultrarunning for more than 15 years, from writing for early trail mags to her popular Substack newsletter Mountain Running and Living. She joins us to talk about how she went from journalism to the trails, and how running became not just a sport but a second career.

Sarah opens up about what it means to write honestly about midlife and aging, how she’s rethinking her relationship with alcohol, and why acceptance is sometimes the hardest training block of all. She also shares the story of finishing Hardrock at 56 and why stage racing like the Grand to Grand Ultra has become her true test of endurance. Along the way, we get into parenting at aid stations, practicing maximum enthusiasm, and how she’s turning all of this into her next big project: a memoir.

It’s a conversation about resilience, storytelling, and the strange joy of chasing meaning in the mountains, sometimes through suffering, sometimes through laughter, but always through a love of the trail.

Thanks to Running Warehouse for sponsoring The Trailhead!

This week's featured race, Go Wild! Marin Challenge.

.

📣 Listener Survey: We want your feedback to keep making podcasts you love! Take our quick listener survey. Take it here!

This week on The Trailhead, Zoë and Brendan sit down with writer and ultrarunner Nick Triolo, author of The Way Around: A Field Guide to Going Nowhere. From circumnavigating mountains to ditching Strava and racing for a year, Nick shares what it means to move through landscapes differently, choosing circles over summits, presence over performance, and curiosity over metrics.

We talk about why loops feel so satisfying, how creative practice overlaps with running, and what happens when you stop measuring progress and start running just to run. Plus, the crew debates their favorite loops and why “there’s nowhere else to go” might be the ultimate running mantra

🏃‍♀️ Featured Race: Cowboy Yeti in Bastrop, Texas—20K loops, mild winter weather, and maybe even Brendan’s birthday bash.

👟 Sponsor: Thanks to Sidas for supporting this episode. Keep your feet happy on every loop with high-performance socks, insoles, and blister protection—UltraSignup listeners get 20% off at sidas.us.

Love our podcasts? Help us make them even better! Take our quick UltraSignup Podcast Listener Survey!

What happens when a road marathoner tackles one of the wildest ultra challenges out there, solo?

In this episode, Zoë and Brendan sit down with Tommie Runz (@tommie_runz): plant-based athlete, podcast host, father, and (accidentally?) ultra-endurance legend.

Tommie didn’t grow up running, but after choosing sobriety in 2017, he found clarity, purpose, and eventually, a new identity in the miles. We trace his journey from gym rat to six-star marathon finisher to taking on The Speed Project solo—six ultramarathons in six days across the desert, with no prior experience beyond 26.2.

He opens up about recovery (physical and emotional), the myth of “rock bottom,” and how a surprise video from his kids mid-race broke him down, and gave him the strength to keep going.

Also: vegan aid station food, the case for trekking poles on pavement, and whether road ultras are actually super hardcore.

Thanks to our partners at LMNT – A tasty electrolyte drink mix with everything you need and nothing you don’t. Get a free sample pack on us!

Check out the Kismet Cliff Run to experience on of the Beast Coast's coolest trail races! Race is September 14, registration is open now!

Be part of shaping the future of UltraSignup podcasts. Share your feedback in our quick listener survey.

UTMB champion. Western States course record threat. Field hockey state champion. Rock doctor. Katie Schide is one of the most accomplished ultrarunners on the planet, and somehow, still one of the most quietly focused. In this episode of The Trailhead, Zoë and Brendan catch up with Katie ahead of her Hardrock 100 debut to talk about how she’s evolved as a competitor, why she used to downplay her ambitions, and what’s changed in both the sport and herself since her eighth-place finish at UTMB back in 2021.

They dig into why UTMB might just be the “Goldilocks” race of the sport, how Katie and her partner are spending the summer training in Colorado’s San Juans, and how her background in geology shapes the way she sees, and runs through, the landscape. Katie also shares her take on the term “sub-ultra” and why she thinks we’ve maybe overcomplicated what’s just... running.

Plus, Buzz Burrell drops in for a TrailCon Hall of Fame recap, a preview of a potential Katie vs. Courtney showdown at UTMB, and a quick nod to the real MVPs: New England moms on Facebook.

This episode is brought to you by SIDAS, makers of high-performance insoles, socks, and footbeds specifically designed for trail running. Whether you're grinding out vert or trying to keep your feet happy past hour six, SIDAS gear is built to handle the unpredictable trail, so your feet don't have to. Check them out at sidas.us and give your feet the upgrade they deserve.

And if you’re dreaming of a trail experience that’s less race and more wild adventure, don’t miss our featured adventure: Ruta de los Arrieros, a three-day expedition run through Colombia’s ancient gold routes. Expect big climbs, river crossings, waterfall rappels, jungle villages, and about as much trail magic as you can handle. It’s capped at just 10 runners this year and kicks off September 14, so if you’re into chasing moments instead of PRs, this one’s for you. Registration closes August 20 at UltraSignup.

Be part of shaping the future of UltraSignup podcasts. Share your feedback in our quick listener survey.

This week on The Trailhead, we’re joined by the one and only Kofuzi, a self-proclaimed non-elite YouTube runner who’s built a global following by filming marathons, gear reviews, and everyday runs with heart, humor, and a handheld camera. Zoë and Brendan chat with him about the leap from roads to trails, what it really takes to make running content, and why being “exceptionally average” might be a superpower.

Whether you’re here for the shoe talk, the trail stoke, or the shared love of goofy long runs, this one’s for you.

Follow Kofuzi: YouTube & Instagram: @kofuzi

Thanks to Running Warehouse for supporting the Trailhead! Check them out for all your gear, apparel and nutriton needs.