Orangetheory’s cosmic success hasn’t burned out since 2010. That’s because its research-minded approach to fitness actually works. It’s all about heart rate-based interval training. When you spend 12 or more minutes of an hour-long class in orange or red zones (see chart below), muscles’ need for oxygen skyrockets. Your body answers by oxidizing carbs and […]
from Men's Journal https://ift.tt/dwabuiE
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