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Matt Fossey, PT SEPiT MSc BSc

@thetrainingmentality

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• Psychological Informed Coach | Third Space
• Sport and Exercise Psychologist in Training
• [email protected]

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Mallorca 70.3 Ironman.

You never forget your first Ironman event.

The 1.9km swim? Staying calm in chaos.

The 90km bike? The disciple of chunking.

The 21km run? Enjoying every moment.

Crossing that finish? One of those moments where you really think of how much support sits behind this individual sport.

To team Third Space, thank you for the motivation, discipline, and community that you have provided for the last 6 months.

To @prettyplantpowered, thank you for your support, patience, and letting me eat all the jam in our house. I couldn’t have done this without you.

Full race breakdown pending, but for now it’s all about resting, reflecting, and trying to get the thoughts of what completing a full Ironman would feel like out of my head 👀

#proud
#ironman
#triathlon taken in Mallorca, Spain by @thetrainingmentality

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63

5 months ago

Battersea Park Marathon.

Going into this race, I had doubts - my ITBS injury, race day pacing strategy, and on whether I should even be out there at all.

At 26km, pace slipped off and negative thoughts started to flood my mind. I was ready for them. Instead of focussing on my calf and hamstring cramps, I focussed on the things I could control: cadence, breathing, rhythm.

It paid off. I’m proud to say that this is a 32 minute PB - something I genuinely didn’t think was possible.

A huge thanks to @prettyplantpowered for supporting me on race day and for the last 20 weeks. To my friends and family who supported on the day, post race, and throughout my training block.

I could not have done it without you.

#proud
#running
#marathon taken in Battersea by @thetrainingmentality

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79

a year ago

The Training Mentality

As there is a few new faces around recently I want to reintroduce myself and show what this is all about.

This page exists to help people make small, repeatable improvements every single day.

Over 8 years of coaching and helping thousands of people, I’ve seen that real development comes from seeing improvements, consistently. From helping people build confidence in their training, to guiding them through setbacks, plateaus, and long-term progression. The focus is always the same: sustainable improvement, not quick wins.

Facing challenges of multiple marathons, HYROXs, and other fitness competitions has made me learn a lot. None of it has ever been about medals or finish lines. It’s about understanding the process and what actually drives progress when motivation fades, pressure builds, and uncertainty creeps in.

The Training Mentality is about pursuing 1% more than you thought you were capable of with intelligent programming, honest self-assessment, and scientific insight.

This work is ongoing in 2026. Physical challenges with a half Ironman, deeper study with Sport and Exercise Psychology training, and continued applied practice.

If you value evidence, experience, and long-term development over hype and social media trends, you’re in the right place.

And if you think this page can help you, follow for insight into developing a stronger training mentality.

One session, one decision, one percent at a time - that's The Training Mentality. taken in London, United Kingdom by @thetrainingmentality

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9 months ago

Signed up for a Hyrox and need some inspiration 🤝

Wall balls - 30
Burpees - 40
Ski erg - 500m
Rower - 750m
3 rounds

Every 5m:
Synchro run 250m

Send this to your Hyrox partner 🫡

@thirdspacelondon
📍Wimbledon taken in Third Space London by @thetrainingmentality

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4 days ago

5 and a half weeks until hyrox for macmillan. nervous and excited in equal measure 💥

tb to an epic class at pace with great company.

donation link in bio 🫶🏻

#hyrox #hyroxdoubles #hybridtraining #londongym #hyroxtraining taken in Borough by @thetrainingmentality

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12 days ago

One bad session is a data point. Not a verdict.

What decides how much it costs you is the story you tell afterwards.

Weiner’s Attribution Theory showed that how we explain a setback shapes what happens next.

‘I’m not good enough’ is fixed, and it flattens you.
‘My sleep was off and I was stressed’ is temporary, and you can act on it.

Same outcome, different attribution, completely different mindset.

Log it, name one thing you’d change, and close the tab.

Save this for your next rough workout.

#mindset
#mentality
#psychology taken in London, United Kingdom by @thetrainingmentality

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13 days ago

One thing at a time.

#recap
#fitness
#consistency taken in London, United Kingdom by @thetrainingmentality

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14 days ago

Do you only need to change your motivation to increase your fitness habits?

No.

COM-B is a behaviour change model that says all behaviour is influenced by three factors.

Capability.
Opportunity.
Motivation.

Find the missing one and try and fix that one.

Share this to a friend that might find this useful.

#model
#psychology
#behaviourchange taken in London, United Kingdom by @thetrainingmentality

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18 days ago

Conditioning inspo 🫡

E6MOM (for 6 rounds) - Every 6 minutes switch between A and B

A
Farmers Walk - 200m
Wall Balls - 40
Lunges - Max

B
Ski - 200m
Rower - 400m
Burpees - Max

📍@thirdspace
Wimbledon

#hyrox
#workout
#trainingforlife taken in Third Space London by @thetrainingmentality

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24 days ago

One thing at a time.

#recap
#fitness
#personaltrainer taken in London, United Kingdom by @thetrainingmentality

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a month ago

You’re not behind.

You’re comparing your behind-the-scenes to someone else’s highlight reel.

Achievement Goal Theory (Nicholls) splits how we measure ourselves in two.

Judge today’s you against last week’s you and you tend to train with more enjoyment and more consistency. Judge yourself against everyone else and it usually comes with anxiety and dropping off.

Their pace came from their training, their recovery, their life, none of which you can see. The only comparison that measures anything is this week’s you against last week’s you.

Send this to whoever needs help for comparisons to others.

#mindset
#psychology
#comparison taken in London, United Kingdom by @thetrainingmentality

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a month ago

Yard Games 2026

What a club, what a community hosted at #thirdspacewimbledon

Thanks to @noccouk for fuelling our athletes on the day.

Until next year @thirdspacelondon 🤝 taken in Wimbledon Centre Court by @thetrainingmentality

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2 months ago