42:I[58016,["/_next/static/chunks/0e29vbidvogc6.js","/_next/static/chunks/09md0.811p4qk.js","/_next/static/chunks/0jjo8hz~ewue4.js","/_next/static/chunks/084k0pvimg.lq.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0d1e9m2ig9v3v.js","/_next/static/chunks/0dzini03ngxm2.js","/_next/static/chunks/0rizq9ux3s1w3.js","/_next/static/chunks/139o5utivfajl.js","/_next/static/chunks/0i-f~c821e7uk.js","/_next/static/chunks/0z7avafhgjcyr.js"],"ProcessEpisodeButton"] 44:I[185,["/_next/static/chunks/0e29vbidvogc6.js","/_next/static/chunks/09md0.811p4qk.js","/_next/static/chunks/0jjo8hz~ewue4.js","/_next/static/chunks/084k0pvimg.lq.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0d1e9m2ig9v3v.js","/_next/static/chunks/0dzini03ngxm2.js","/_next/static/chunks/0rizq9ux3s1w3.js","/_next/static/chunks/139o5utivfajl.js","/_next/static/chunks/0i-f~c821e7uk.js","/_next/static/chunks/0z7avafhgjcyr.js"],"SendEmailButton"] 45:I[45269,["/_next/static/chunks/0e29vbidvogc6.js","/_next/static/chunks/09md0.811p4qk.js","/_next/static/chunks/0jjo8hz~ewue4.js","/_next/static/chunks/084k0pvimg.lq.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0d1e9m2ig9v3v.js","/_next/static/chunks/0dzini03ngxm2.js","/_next/static/chunks/0rizq9ux3s1w3.js","/_next/static/chunks/139o5utivfajl.js","/_next/static/chunks/0i-f~c821e7uk.js","/_next/static/chunks/0z7avafhgjcyr.js"],"SignupCTA"] 47:I[56939,["/_next/static/chunks/0e29vbidvogc6.js","/_next/static/chunks/09md0.811p4qk.js","/_next/static/chunks/0jjo8hz~ewue4.js","/_next/static/chunks/084k0pvimg.lq.js","/_next/static/chunks/0a~e7k..h6jfc.js","/_next/static/chunks/0d1e9m2ig9v3v.js","/_next/static/chunks/0dzini03ngxm2.js","/_next/static/chunks/0rizq9ux3s1w3.js","/_next/static/chunks/139o5utivfajl.js","/_next/static/chunks/0i-f~c821e7uk.js","/_next/static/chunks/0z7avafhgjcyr.js"],"EpisodeTranscript"] 3c:["$","span",null,{"className":"inline-flex items-center gap-2 bg-secondary/50 px-3 py-1 rounded-full","children":[["$","svg",null,{"className":"w-4 h-4","fill":"none","stroke":"currentColor","viewBox":"0 0 24 24","children":["$","path",null,{"strokeLinecap":"round","strokeLinejoin":"round","strokeWidth":2,"d":"M8 7V3m8 4V3m-9 8h10M5 21h14a2 2 0 002-2V7a2 2 0 00-2-2H5a2 2 0 00-2 2v12a2 2 0 002 2z"}]}],["$","time",null,{"dateTime":"2025-08-30T00:00:00.000Z","children":"Sat Aug 30 2025"}]]}] 43:T42e,

Running since 1980, today’s guest has completed 126 marathons and 44 Ironmans across 22 countries, including two starts at the Ironman World Championships in Kona. He ran the first London Marathon in 1981 and is aiming to return for the 50th anniversary in 2031.

We had a chat after Dunstable Downs Parkrun and in this episode, we cover four decades of running: how marathons felt in the days before technology, the pride of competing shoulder to shoulder with athletes like Hugh Jones, the importance of setting new challenges, and what keeps him coming back year after year.

We also dive into the mental game of endurance: why resilience often matters more than speed, how to push past the wall, and the lessons he’s learned about motivation, community, and finding balance through sport.

This is an inspiring, wide-ranging conversation with someone who has seen running evolve over generations — and who still has unfinished business on the start line.

You can find him on Instagram at https://www.instagram.com/ironmate_coaching/

126 Marathons, 44 Ironmans: A Lifetime of Running with Mark Kleanthous