Gareth Holebrook is a coach and practitioner working at the intersection of leadership, deliberate practice, and resilience. He has spent decades helping individuals and teams make better decisions under pressure and sustain progress over long horizons.

Alongside his professional work, Gareth has completed multiple Ironman-distance endurance events, using them as a proving ground for disciplined intent, endurance, and reflection. His thinking is shaped less by motivation or optimisation, and more by what survives contact with fatigue, friction, and time.

The Ishi Spiral draws on this lived experience, combining practical coaching insight with concepts rooted in Japanese philosophy. Gareth is currently working on a forthcoming book, Ishi: The Discipline of Determined Intent, which expands these ideas further.

He regularly posts about these ideas on Substack. https://substack.com/@garethholebrook