To all those who watch TV and do breathing/pranayama just by watching TV. Kapalbhati and Bhastrika are EXTREMELY powerful techniques and leave a profound impact on our mind and the body. At the same time, these 2 practices also have a very strong effect on our Autonomic Nervous System (via heart rate changes). If you have Diabetes or Hypertension, please do NOT do any Kapalbhati or Bhastrika practices without seeking the guidance of qualified yoga teacher. There are many other practices you can do but NO to Kapalbhati and Bhastrika (especially with above 2 disorders). The visual shows heart rate variability

Heart Rate Variability (HRV)  is an important measure of autonomic nervous system (Read more about Stress and ANS here) and there is increasing research in the area of HRV and its positive benefits in metabolic disorders (e.g. diabetes, hypertension) and general wellness. HRV is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval. HRV is used to identify potential health challenges by medical doctors. HRV can also be used as a marker of stress (or autonomic nervous system imbalance).  In general, higher HRV (more variations in the interval) indicates a more balanced

Background information on Chakra Human ecosystem is not just a physical body but 5 layers of existence (see Pancha Kosha for details).  Chakras are part of the etheric body (or Pranamaya kosha).  At one end, they integrate with our Annamaya kosha (physical body) and at the other end they integrate with Manomaya kosha (mind, emotions, etc).  While we segregate the layers for our understanding, it is important to realise these are not water tight compartments ! If we deep dive further, the integration of each chakra with other 2 of the 5 layers of existence can be described as below: