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There is no better confirmation that training works than Sam's (aka globerunnergriff) journey.
He went from 125kg to a 2:22 marathon in 3 years, driven by grit and consistency. We go into his training from the early injury-riddled days of starting out, then pushing through and building up the mileage over time.
NB: Sam's been a kaizen user for over a year primarily tracking progress trends, although he'd NEVER fine tuned his predictions. So whilst his progression is an accurate, the final numbers are off (which is mentioned). We dialled everything in after the recording.
Sam's training is all available here: https://www.strava.com/athletes/32613852
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kaizen
Download the app: https://kaizen.app.link/milesbetter
Strava club: https://www.strava.com/clubs/runkaizen
Website: https://runkaizen.com/
Instagram: https://www.instagram.com/runkaizen/
Michael: https://www.strava.com/athletes/32067191
Josh: https://www.strava.com/athletes/1721750
If you want to see a pro's training and prediction data in kaizen, then check this one out.
Jimmy Whelan joins us to analyse his training from his 61:37 HM debut in Valencia 2025, and also dive into the training data since then for some of his other performances on the roads in 2026.
We compare the data between some of his more impressive training blocks over the past 12 months, and some of the key themes that keep popping up when he's in his best shape.
Jimmy's training is all available here: https://www.strava.com/pros/3356275
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kaizen
Download the app: https://kaizen.app.link/milesbetter
Strava club: https://www.strava.com/clubs/runkaizen
Website: https://runkaizen.com/
Instagram: https://www.instagram.com/runkaizen/
Michael: https://www.strava.com/athletes/32067191
Josh: https://www.strava.com/athletes/1721750
A deep dive into the training and racing data behind Josh's 2:32 in London on one of the hot years, where he placed 46th.
Detailed analysis into the training that went into it, including 200k+ weeks, triple days and extreme active heat training.
Also some chat about sweat, both smelly and odourless.
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kaizen
Download the app: https://kaizen.app.link/milesbetter
Strava club: https://www.strava.com/clubs/runkaizen
Website: https://runkaizen.com/
Instagram: https://www.instagram.com/runkaizen/
Michael: https://www.strava.com/athletes/32067191
Josh: https://www.strava.com/athletes/1721750
We dive deep into the data Michael's marathon PB relative to his previous best. Figuring out what led to the improved performance based on what the numbers are saying, both through the training block and race execution.
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kaizen
Download the app: https://kaizen.app.link/milesbetter
Strava club: https://www.strava.com/clubs/runkaizen
Website: https://runkaizen.com/
Instagram: https://www.instagram.com/runkaizen/
Michael: https://www.strava.com/athletes/32067191
Josh: https://www.strava.com/athletes/1721750
Back after a month off. We dive into:
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kaizen
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Michael
Josh
Back in your earwaves after a little hiatus, and talking about:
Tune in for some hot takes on how to spend your time if you want to run fast.
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kaizen
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Strava club
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Michael
Josh
Special series incoming covering the history of how Josh developed the training system behind Kaizen and how it's
This episode goes through how it works, and how it all started, all the way back at the beginning of Josh's running journey.
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Kaizen
Download the app
Strava club
Website
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Michael
Josh
Michael sits down with everyone's favourite dad marathoner, Eric Floberg, fresh off a PB at his home race at the Chicago Marathon.
Hear about what it's like to have people shouting your name the entire way along a marathon course, and a pretty honest appraisal of the mental game in the last 10km.
Michael and Josh dissect their performances at the unbearably hot 2025 edition of the Berlin Marathon over the weekend.
Both of them well off where they wanted to be given the conditions.
Josh executed brilliantly in the circumstances, posting a 2:43 with a 3-4 minute positive split, whereas Michael managed a 2:50 with a 10 minute positive split.
Hear about what went wrong, and what's going to change leading into their next races at Deauville and Valencia respectively.
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Kaizen
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Michael
Josh
It's race week. Josh and Michael have wrapped up their training, are tapering (perhaps too aggressively), and talk about race prep.
Lots of talk about how to handle the forecasted warmer conditions, whilst Michael is struggling with managing an unexpected setback.
Race plans and expectations have diverged slightly, although the weather may bring them back together come race day.
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Kaizen
Download the app
Strava club
Website
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Michael
Josh
From the publisher's feed
If you want to understand the levers of breakthrough running performances, kaizen founders Michael and Josh analyse training blocks of runners through a data/load lens.
Featuring…