When you breathe in and out your heart rate changes which is called 'heart rate variability' (HRV) or more specifically 'respiratory sinus arrhythmia' (RSA). However, stress & anxiety reduces the heart variability:
Vasso shows you how to de-stress with the help of breathing exercises which in turn should increase the heart rate variability:
Recorded with our Attys and AttysECG.
Check out the commercial HRV product for Athletes: https://www.hrv4training.com/