Relentlessly Obsessed: What I learned from Simon Whitfield Relentlessly Obsessed: What I learned from Simon Whitfield by Joel FilliolInsights from the career of triathlon's first Olympic Champion Read on Substack Newer:Joel Filliol on the Real Principles of Endurance Performance and Why Zone 1 Still WinsOlder:Top 20 Rules for Faster Triathlon Swimming PostedMarch 19, 2026 AuthorJoel Filliol
