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In this episode of Running with James, we dive deep into the critical 20%—the speed work, tempo runs, and threshold efforts that push you past plateaus and build true race-day power. From short intervals to long grinding efforts, we break down the purpose behind each workout and how they train different energy systems to meet the demands of your sport—whether you’re prepping for HYROX, a marathon, or anything in between.

We also kick things off with a look at Faith Kipyegon’s legendary sub-4 minute mile attempt and what we can all learn from the way champions train. If you’re ready to level up, this episode shows you where the magic really happens.

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