Trail Society

This week, Corrine Malcolm and Keely Henninger nerd out on what actually happens inside your body during — and after — an ultramarathon. Using recent research alongside what we already know about endurance physiology, they work system by system through the muscle damage, inflammation, kidney stress, cardiovascular changes, neurological fatigue, immune response, metabolic shifts, and GI issues that can come with pushing your body for hours on end.
They also dig into the difference between normal post-race weirdness and something worth paying closer attention to, why recovery can take much longer than simply waiting for sore legs to disappear, and what we still don’t know about the long-term effects of repeatedly racing and training at ultra-endurance volumes. Along the way, they talk about CK and rhabdo, acute kidney injury, post-race hypotension, heart remodeling, cognitive fatigue, RED-S, GI distress, and why fueling, hydration, sleep, and adequate recovery matter so much.
It’s a science-heavy conversation about what your body is actually managing when you ask it to run really, really far — and why understanding that process can help you recover better and keep doing this sport for the long haul.

This week, Corrine Malcolm sits down with Jessie Diggins, Olympic champion, multiple-time World Cup overall champion, and one of the most accomplished American cross-country skiers ever, for a conversation about what happens when sport stops being your job. Now retired from professional skiing, Jessie is stepping into a very different chapter — one that includes trail running, public speaking, advocacy, and learning what it feels like to be a beginner again.
They talk about identity after elite sport, what training means when there isn’t a podium waiting at the end, and how Jessie is deciding which parts of her competitive life she wants to carry forward. They also dig into her first 100-miler at Minnesota’s Superior 100, the team she brought along for the experience, what surprised her about the distance, and whether she’s caught the ultra bug.
It’s a thoughtful conversation about reinvention, curiosity, and what it looks like to keep loving sport when the outcome no longer has to mean anything.
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Use the code FEISTY2026 for 20% off at https://www.tifosioptics.com
ProBio: Use code Trail20 for 20%-off orders (30%-off + free shipping w/ subscriptions) at https://www.probionutrition.com/
rabbit: Visit https://www.runinrabbit.com/ use code: SEPTEMBERTRAIL10 for 10% off.

This episode originally aired March 31st, 2026
Olympic medalist Shannon Rowbury and pelvic health physical therapist Jess Dorrington join Corrine to talk about their new book, Strong as a Mother, and the bigger conversation around pregnancy, postpartum, and athleticism. Together, they explore what it means to stay active during pregnancy, how runners can think about returning to sport postpartum, and why strength during motherhood may look different, but no less powerful.
They also dig into pelvic floor health for runners, common misconceptions around exercise during pregnancy, and why so much advice in this space can feel confusing or incomplete. Jess breaks down why pelvic health matters not just for pregnant and postpartum athletes, but for runners more broadly, while Shannon reflects on her path from Olympian to mom rediscovering joy in movement.
Along the way, they talk about how Strong as a Mother came together, why the title changed from Running for Two, and what they hope athletes, moms, and active women take from the book: your body is capable of more than you think, and there is no one right way to move through this season. Shannon also shares more about her long Olympic medal journey and anti-doping advocacy.
Follow Us:
Courses and Coaching: https://livefeisty.com/courses/
@feisty_media
@trail.society
Support our Partners:
Use the code FEISTY2026 for 20% off at https://www.tifosioptics.com
ProBio: Use code Trail20 for 20%-off orders (30%-off + free shipping w/ subscriptions) at https://www.probionutrition.com/
rabbit: Visit https://www.runinrabbit.com/ use code: SEPTEMBERTRAIL10 for 10% off.

This week, Corrine Malcolm and Hillary Allen dig into one of the most important — and sometimes overlooked — parts of an athlete’s support system: finding the right coach. They talk about what actually makes a good coach-athlete fit, from communication and collaboration to goal alignment, professionalism, and whether a coach is truly invested in you as a person rather than just your performance.
They also explore the red flags that can emerge once a coaching relationship is underway, why athletes should pay attention to how a coach responds when things get hard, and what it looks like when a relationship simply reaches its natural end. Plus, they walk through what to do if a coach exits at a difficult moment, how to rebuild trust in a new coach, and why self-advocacy and a broader support team can make all the difference.
It’s a practical conversation about building the right team around you, asking better questions early, and remembering that you’re allowed to want a coaching relationship that actually fits.
Follow Us:
Courses and Coaching: https://livefeisty.com/courses/
@feisty_media
@trail.society
Support our Partners:
Use the code FEISTY2026 for 20% off at https://www.tifosioptics.com
ProBio: Use code Trail20 for 20%-off orders (30%-off + free shipping w/ subscriptions) at https://www.probionutrition.com/
rabbit: Visit https://www.runinrabbit.com/ use code: SEPTEMBERTRAIL10 for 10% off.

This week, Corrine Malcolm sits down with Chelsea Sodaro, Ironman World Champion, mother, and founder of Unlocking Yes, for an honest conversation about what happens when the things you want most in life seem to compete with one another. Chelsea traces her path from professional running to triathlon, the decision to become a mother at the height of her athletic career, and the uncertainty that came with wondering what pregnancy might mean for her future in sport.
They also dig into the much messier reality behind Chelsea’s remarkable postpartum return and 2022 Ironman World Championship win — from breastfeeding and childcare challenges to serious mental health struggles that existed alongside tremendous professional success. Chelsea shares what she learned about the support athletes actually need, why maternity policies are only the beginning, and how projects like Unlocking Yes are helping her turn her own experience into something bigger.
It’s a thoughtful conversation about motherhood, ambition, identity, and what sport could look like if women didn’t have to be extraordinary just to have the freedom to choose more than one thing.
Follow Us:
Courses and Coaching: https://livefeisty.com/courses/
@feisty_media
@trail.society
Support our Partners:
Use the code FEISTY2026 for 20% off at https://www.tifosioptics.com
ProBio: Use code Trail20 for 20%-off orders (30%-off + free shipping w/ subscriptions) at https://www.probionutrition.com/
rabbit: Visit https://www.runinrabbit.com/ use code: SEPTEMBERTRAIL10 for 10% off.