Learn how heart rate zones works and how to properly train for endurance sports, including polarised training, high intensity intervals and more. <img width=”1400″ height=”787″ src=”https://bengreenfieldfitness.com/wp-content/uploads/2013/03/How-Heart-Rate-Zones-Work.png” class=”attachment-full size-full post-image” alt=”” srcset=”https://bengreenfieldfitness.com/wp-content/uploads/2013/03/How-Heart-Rate-Zones-Work.png 1400w, https://bengreenfieldfitness.com/wp-content/uploads/2013/03/How-Heart-Rate-Zones-Work-300×169.png 300w, https://bengreenfieldfitness.com/wp-content/uploads/2013/03/How-Heart-Rate-Zones-Work-768×432.png 768w, https://bengreenfieldfitness.com/wp-content/uploads/2013/03/How-Heart-Rate-Zones-Work-1024×576.png 1024w” sizes=”(max-width: 1400px) 100vw, 1400px”
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