UNTAPPED with Spencer Matthews
UNTAPPED with Spencer Matthews
High Performance
Mary McCarthy Debunks Over-Training Rumours, Stress Fracture Accident and Online Critique
1 hour 11 minutes Posted Jun 15, 2026 at 1:00 am.
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Mary McCarthy isn't just a content creator who runs, she's putting down 60-mile weeks and running elite-level times without a professional setup.


In this episode, she explains why she runs her easy days genuinely slow, treats the first 30K of a marathon as a warm-up before racing the final 12, and why your Strava heart rate zones are probably lying to you.


She talks about fueling like her male training partners because under-eating is a direct route to injury, shares the brilliant story of overtaking her ex-boyfriend in the final 200 meters at Valencia without him even knowing, and addresses the criticism that comes with being a content creator running serious mileage.


Her message to the critics: you can't judge someone's training from the outside, the same way you wouldn't judge someone else's relationship.


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