Heart Rate Variability Inc. employs learning aids that make

employs learning aids that make the technical aspects of the research process approachable and easy to understand

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have sold more than 2 million copies

each of the 116 training programs is rated according to workout duration

Heart Rate Variability Inc. employs learning aids that makeUnderstand heart rate variability and its role in athletic performance. Heart rate variability (HRV) is a valuable tool used to assess cardiac function, evaluate mental and emotional well being, andwhen used by athletes and coachesoptimize training based on each athlete's unique data. Written by a world renowned author team, Heart Rate Variability: Science and Strategies for Peak Performance introduces the fundamentals of HRV and provides practical