An Essential Workout from Olympian Marielle Hall
The 2016 Olympian in the 10,000 meters likes to compare her progress over the course of a training cycle with some 300-meter intervals. Here's how you can try it, too.
The 2016 Olympian in the 10,000 meters likes to compare her progress over the course of a training cycle with some 300-meter intervals. Here's how you can try it, too.
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