Ever wondered what running sessions the world's top triathletes are doing?

We caught up with some of the world's best pros out in Kona—including Kristian Blummenfelt and Gustav Iden—to find out what their toughest run workouts look like, then put them to the test to see just how brutal they really are.

00:00 Intro

01:00 What are the pros' favorite (and toughest) sessions?

04:00 Warming Up & Session Breakdown

05:54 Starting the Session & Pace Zones Explained

11:37 1km Reps Done | Onto the 400m Reps

14:22 Reflecting on the Session

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Drop your all-time favorite (or most brutal) running session in the comments! 👇

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