Practitioners of Hatha Yoga the classic text on yoga postures claim the attainment of following health benefits, in particular: enhances the vital capacity of the lungs & resultant endurance of the respiratory system, improves cardiovascular health with low levels of cholesterol, keeping blood pressure & pulse rate normal; strengthens the nervous system & reduces the risk of lifestyle disorders like diabetes, heart ailments & hypertension; brings about normal immune response & prevent pro-inflammatory disease like arthritis, asthma, cancer & stroke, lowers the risk of injuries as it builds muscle & strengthens the bones; brings hormones into a harmonious balance, fighting fatigue (when low) & irritability (when high), lowering levels of depression causing serotonin, serving as pain management system by reducing its frequency & intensity, promoting the happy hormone dopamine, and to get good sleep quality, pattern & duration with enhanced secretion of melatonin hormone.
Studies & findings with yogic interventions explain how Yoga works on the brain and enhances cognition; by showing a significant increase in gray matter in the hippocampus, which is associated with learning and memory, and a decrease in gray matter in the amygdala, which is associated with anxiety and stress. This action leads to a reduction in stress hormones ACTH & cortisol, which regulates the sympathetic nervous system (the fight or flight response) & the parasympathetic nervous system (arrest mechanism). It helps to keep in check hyper- or hypo-thyroidism; by bringing about homeostasis, which is the intelligence of the body to maintain balance between the various systems.
The chemical changes in the cells, tissues, and organs owing to environmental and genetic factors lead to neurodegeneration, decalcification, demineralization, and DNA damage. This can be reversed with conscious pumping of rejuvenators via a yogic lifestyle. In effect healthy habits reactivate & replenish enzymes, dramatically altering the trajectory of cell replication and chromosome shortening. Meditation, exercise and a diet full of healthy fats and vegetables are known to infuse and expose cells such, as to cause the gene expression to change, which helps to live longer and better.