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#17: Heart Rate Training with 2:21 Marathoner Jason Cherriman

The Extramilest Podcast

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Are You Seeing Aerobic Efficiency Shifting Over Time?

"I see a lot of runners, you know, doing way too much. I've been guilty of it in the past," he says. "It's a hard balance." He is aiming to get under 220 miles for his first marathon at London 2012.

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