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Independent of injury risk, easy running is indispensable for long-term speed development. That seems counterintuitive. But if running training were an episode of MTV Cribs, when they got to the room with easy running, you’d say “This is where the magic happens” as you winked at the camera. Easy running enhances capillary development and aerobic enzyme activity—introduce an anaerobic stimulus to the mix, and it all gets mucked up. It also increases your running economy, reducing the amount of energy it takes to go a given pace.
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