Why easy workouts in zone 2 have big benefits for your heart, your performance, and your lifting routine. 6 min read A MINUTE AGO, high-intensity interval training (HIIT) was king. Now that gut-it-out-and-get-the-glory work might need to share the crown with slow and steady efforts, thanks to what they do for your body, your longevity, and maybe even you... [7652 chars]
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