How do you do this breathing exercise for stress?
"What works for most people is to inhale for four seconds and exhale for six seconds with no pause in between. Start by breathing at this rate for two minutes (set a timer). Begin by inhaling through your nose and exhaling through pursed lips as if you’re blowing on hot food. As you mentally count four seconds in, six seconds out, focus on the sensation of air flowing in through your nose and out through your mouth.
When you’re done, take stock of how you feel. Many people say they are less anxious and more alert. Work your way up to doing this breathing for 20 minutes twice a day, and your baseline heartbeat will be lower, which means your heart won’t have to work as hard, making it — and you — healthier overall." (BTW, even Tracee Ellis Ross is a fan of using breathing exercises to reduce stress.)