Hello Reader, I wanted to share a quick story and a new release I’m really proud of. Years ago, when Kyle Buckingham crossed the line first at Ironman South Africa, he reflected later and said to me: “Paul—I know you’re trained as a physiologist, but really, you’re more of a psychologist.” Kyle Buckingham: The Sweetest Victory at his Home Race – Ironman South Africa It made me smile. Andi Boecherer once told me almost exactly the same thing after winning Ironman Lanzarote. It took me back to...

The Catalyst —My 36-Hour Fasted Climb A few weeks ago I finished recording a podcast with Prof. Tim Noakes and Dr. Phil Maffetone—two mentors whose work underpins much of my own coaching. Inspired (and a little rattled) by their latest thinking on the importance (or lack thereof) of muscle glycogen, I tested my own beliefs in the subsequent days: Fed vs. 36 hours fasted (black coffee + water). 90-min climb up Mt Revelstoke. Result: Personal-best power with –13 % Athletica Workout Reserve. One...

Hello Reader, We’re genuinely pumped about this release. One year ago HYROX wasn’t even on our radar—until our colleague Dan Plews (HYROX World Champion & HIIT Science contributor) sat down with Martin Buchheit on the Training Science Podcast. The forum lit up. “Can Athletica build an adaptive HYROX plan?” Today—we’ve delivered. What is HYROX, anyway? HYROX has rocketed from just 650 pioneering athletes in 2017 to roughly half a million competitors across five continents in the 2024-25...