Topics covered in this episode:What is heart rate variability?What's the most accurate and seamless way to measure HRV?When should you measure HRV,  overnight vs. morning?What decisions can you or should you make based on HRV?How much data is necessary before HRV becomes a useful tool for an individual athlete?ASK A QUESTION FOR A FUTURE PODCASTGuest: Jason KoopJason Koop is the Head Coach of CTS Ultrarunning, author of "Training Essentials for Ultrarunning, 2nd Ed", creator of the "Research Essentials for Ultrarunning" monthly newsletter, and host of "The Koopcast" podcast. He is one of the most sought-after coaches in ultrarunning, and for many years he was the CTS Coaching Director in charge of coaching education and ongoing mentoring of CTS Coaches across all sports. Find Jason on Instagram, Twitter, or his website: https://jasonkoop.com HostAdam Pulford has been a CTS Coach for more than 13 years and holds a B.S. in Exercise Physiology. He's participated in and coached hundreds of athletes for endurance events all around the world.Links KoopCast with Marco AltiniMarco Altini BlogHRV4Training AppListen to the episode on Apple Podcasts, Spotify, Stitcher, Google Podcasts, or on your favorite podcast platformGET FREE TRAINING CONTENTJoin our weekly newsletterCONNECT WITH CTSWebsite: trainright.comInstagram: @cts_trainrightTwitter: @trainrightFacebook: @CTSAthlete