Inhale for 4 sec, hold for 7 sec, exhale for 8 sec; repeat several times.
Slows heart rate and promotes relaxation by activating the parasympathetic nervous system, which counters the stress-driven sympathetic “fight-or-flight” response, and can reduce stress.
Myerholtz, L. (2023). Take a deep breath. Family Medicine, 55(4), 284.