Our guest today is Trever Gray, In this episode, we discussed about Heart Rate Variability and how you can use that to know when to be able to push yourself in training and when to back off. We've talk about how to breathe properly and how to train yourself, how you can improve your swimming performance using respiratory muscle training. And we've also talked about blood flow restriction training. 00:59 Trever Gray Introduction 02:22 What is Heart Rate Variability? 04:01 How do you measure HRV? 05:20 Overtraining or Undertraining 06:27 Using HRV Data in Training 08:17 Skepticism from Coaches 08:59 Managing HRV Data as a Coach 11:16 Is it for Everybody? 13:32 Respiratory Muscle Training 14:39 Breathing Exercise to Strengthen Respiratory Muscles 20:29 Breathing Exercises During Downtime 21:02 Blood Flow Restriction Training 23:57 How Often Can You Use BFRT? 25:25 How Safe is BFRT?