How does an athlete go from professional cycling to elite distance running — in less than a year?

In this episode of The Marathon Podcast, Jimmy Whelan joins the show to discuss his remarkable transition from WorldTour-level cycling to professional running. After years racing internationally with EF, Jimmy stepped away from cycling — and within a year ran a sub-30 10K and a 61-minute half marathon, earning his place as a professional runner.

We talk about the differences between cycling and running, how aerobic fitness transfers, what surprised him most about running training, and how he’s preparing for his first-ever marathon. This is a fascinating look at elite endurance performance, adaptation, and what’s possible when world-class fitness meets a new discipline.

A must-listen for runners, cyclists, and endurance athletes curious about cross-training, aerobic development, and marathon potential.

Time stamps:

00:00:00 — Introducing Jimmy Whelan

00:03:43 — New Shoes & Faster Workouts

00:06:31 — High School Running to Pro Cycling

00:09:58 — Did Cycling Build His Engine?

00:13:51 — Rediscovering Running’s Simplicity

00:17:32 — Cycling’s Aerobic Advantage

00:29:59 — Training Volume: Cycling vs Running

00:34:15 — Identity Shift from Cyclist to Runner

00:42:25 — Valencia Breakthrough Performance

00:52:30 — Elite Cycling Habits in Running

01:06:18 — Jimmy’s Running Training & Treadmill Work

01:15:35 — Big Goals: Pro Contract, Marathon & Olympics

01:22:00 — Final Thoughts & What’s Next

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