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Continue to ChatRunning is heart work: An intro to low heart rate training. https://percentagerunner.wordpress.com/2016/09/17/running-is-heart-work-an-intro-to-low-heart-rate-training/
Running is heart work: An intro to low heart rate training. https://percentagerunner.wordpress.com/2016/09/17/running-is-heart-work-an-intro-to-low-heart-rate-training/