Podcasts · The Marathon Podcast

#211 The Photo That Changed Everything: Griff Duncan's Running Journey

7 Sep 2026 · 1 h 03 min · S1 E211

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Kristian sits down with Griff Duncan, whose Instagram documenting a couch to 3:03 marathon journey has inspired thousands, for a genuine conversation about how running completely reshaped his identity, his habits, and his confidence.

Griff shares the story behind a photo he took on day one of a fitness challenge, a moment he describes as feeling lost, and how that challenge led him into running almost by accident when a friend wanted to train for a half marathon together. He opens up about the mistakes he made in his first marathon build, the significant lifestyle changes that came with it, including drinking far less and surrounding himself with more active people, and how getting a coach changed the trajectory of his training. The conversation closes with his approach to racing shorter distances to build speed and his next big goal: finally breaking three hours.

In this episode:

- The photo that captured feeling lost before everything changed

- Talking a friend into a half marathon and signing up for a full marathon instead

- Mistakes made during his first marathon training block

- How running reshaped his habits, confidence, and identity

- Significant lifestyle changes that came with getting serious about running

- What made him decide to get a coach

- Being coached in the same lineage as other podcast guests

- Racing shorter distances to build speed for the marathon

- His next goal: finally breaking the three hour barrier

Timestamps

00:00 Welcome and introducing Griff Duncan

01:07 Kristian's Ironman training update

05:01 Welcome to Griff, and previewing the conversation

06:21 Griff's background in fitness and bodybuilding

10:40 Losing his drive after starting a full time job

11:22 Taking on the 75 Hard challenge

12:12 A friend's half marathon idea turns into a full marathon commitment

13:03 Setting his first marathon goals: from sub four to sub 3:30

13:39 Reflecting on his first marathon build

18:04 Why he'd tell new runners they don't need a coach right away

21:49 The value of an outside perspective once you're ready

22:32 What made him decide to get a coach

24:16 Racing more than just marathons to build speed

37:40 How his personal brand and identity have evolved

38:05 The photo that captured feeling lost before everything changed

40:58 The scale of his physical transformation

43:39 Wanting to coach others full time someday

52:48 Reflecting on the jump from 3:39 to 3:03

59:49 The mental hurdle of finally breaking three hours

2:00:43 Closing thoughts and where to follow Griff

Griff on Instagram: https://www.instagram.com/griffduncan/

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Full episodes + the Boston 2025 documentary: https://www.youtube.com/@Warwickruns

Follow my training journey on Instagram: @warwick.runs

Music from Musicbed: MB01XPYH8ZYENVAMB0133EV2TCQFZY

The episode on the publisher’s site ↗ (opens in a new tab)