The Worst Marathon Workout Ever: The Yasso 800s
Yasso 800s have become one of the most popular “predictors” in marathon training. Clean, simple, easy to follow… buuuuuuuut in most cases... completely misleading.
In this video, I wanted to break down why hitting your Yasso 800s perfectly can still leave you walking at mile 20. From a physiological standpoint, these workouts are built around short, high-intensity intervals, while the marathon is a completely different demand: aerobic, continuous, fuel-dependent, and defined by fatigue late in the race. When you try to use one to predict the other, it just doesn’t hold up.
I dived into why this method seems to stick around. That reasoning is simply that it gives runners a false sense of control, plays into survivorship bias, and often favours speed-based athletes who aren’t actually prepared for the real demands of the marathon. The result? Unrealistic pacing, blown races, and a lot of frustration that could’ve been avoided.
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