About Us
Our Brand Vision
Kaizen Rugby was founded by Isaac with a clear mission: help rugby players unlock their full potential and achieve their goals.
With a background in playing, coaching, and performance development, Isaac created Kaizen Rugby to give athletes a smarter, more sustainable path to improvement.
Every program, session, and piece of content is rooted in the Kaizen philosophy - focused on continuous improvement.
We work with players at all levels to improve performance, reduce injury risk, and build resilience that lasts beyond the pitch.
No shortcuts - just real consistent development, one day at a time.
Meet The Team
Isaac Marsh
Founder & Head Coach
Isaac Marsh has spent his life dedicated to rugby, chasing the dream of becoming a top - level professional player. After making his Premiership debut for Gloucester Rugby, he’s come close - but remains grounded in the reality that he hasn’t yet fully achieved the goals he set for himself.
That journey is what drives him. As the Founder and Head Coach of Kaizen Rugby, Isaac is on a mission to help others reach their full potential - both on and off the field. Backed by an MSc in Sports Coaching and a Level 4 Strength & Conditioning qualification, he brings together elite-level experience and evidence-based training methods.
Kaizen Rugby is built on the belief in Kaizen - continuous improvement through consistent, deliberate action. Isaac’s goal is simple: to support and guide players with the structure, coaching, and mindset needed to keep progressing and ultimately achieve their own dreams.
Testimonials
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"I’ve worked with Isaac a lot - his passion for helping others improve makes him a top choice for aspiring rugby players."
Louis Rees-Zammit
1-1 Coaching (In-Person) -
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"Working with Isaac has helped me stay consistent. I’m bigger, stronger and my rugby has improved massively."
Evan Pavarino
1-1 Coaching (Online) -
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"I wholeheartedly recommend Isaac to any young rugby player looking to take their game to the next level."
Sion Hill
1-1 Coaching (In-Person) -
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“Finding Kaizen Rugby has been a game changer for me, I couldn't recommend Isaac enough.”
Olly Spence
1-1 Coaching (In-Person) -
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Far better than any I’ve done before. The personalised programming and regular check ins have made all the difference.
Thomas Usher
1-1 Coaching (Online) -
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"Training with Isaac has been great, I currently feel the strongest I have ever felt. I'm excited to keep building!"
Monique Adcock
1-1 Coaching (Online) -
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"I’ve been improving week after week since joining the programme. Isaac’s continuous support keeps me accountable."
Charles Vanlaetem 1-1 Coaching (Online)
