Jack Ultracyclist rode 3505 kilometres in 7 days to break the world record in Sevilla. Before that, he did the Taiwan KOM four times back to back, then raced the event on the final ascent. This is a bloke who got into cycling through drug addiction and rehab, and now rides bikes for a living.
Key Takeaways
The nutrition piece is worth paying attention to. Jack talks about running on external ketones during the world record attempt, which let him ride at 200 to 230 watts for three to four hours without eating anything. The logic is straightforward: ketones switch you into fat-burning mode and preserve your glycogen for when you actually need it, like a hard effort or the back end of a long day. The threshold where it stops working for him is around 280 watts. Above that, you're back on sugar. For ultra-distance riding specifically, that's a meaningful window.
The other thing that comes through in this episode is how much of the suffering in these events is logistical, not physical. Jack says the two weeks before any challenge are when he's most stressed, because he's deep in spreadsheets and logistics. By the time the riding starts, that's actually the relief. He slept two hours a night across three consecutive Everesting challenges in Italy, France, and Spain. He wasn't running on some special mental toughness. He had a crew he trusted, music that he knew would push him, and a support structure that didn't fall apart under no sleep. That planning is what makes it possible. It's not glamorous but it's what the videos don't show.
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Lawrence Tendam, who gave Anthony the introduction to Jack, has his own episode on the podcast. Go listen to the Pogacar episode if the mental side of elite performance is what you want more of.