Breathe in for 4 seconds, breathe out for 8. The exhale is twice as long as the inhale, and that is the whole idea.
4-8 breathing does one thing: it makes every exhale twice as long as the inhale. There are no holds to count, so your attention can rest entirely on letting the air out slowly. With a twelve-second cycle you breathe 5 times a minute. Of all the patterns in the studio, it is one of the most direct ways to feel what a lengthened out-breath does.
Use 4-8 in the evening, after a tense conversation, or whenever your body feels wound up. It is a good substitute for 4-7-8 if breath holds make you uncomfortable, and it can be done lying down before sleep. If eight seconds is too long at first, try 3-6 as your own pattern and lengthen it over a few days.
Lengthening the exhale is one of the oldest principles of breathing practice, found both in yoga and in modern relaxation training. Heart rate naturally rises a little on the in-breath and falls on the out-breath, so spending more of each breath exhaling is a plausible way to encourage a calmer state. In a 2023 Stanford study comparing breathing practices (Balban et al., Cell Reports Medicine), an exhale-focused pattern improved mood the most, although 4-8 itself was not tested.
Practice sitting or lying down; never in water or while driving. Stop if you feel dizzy.
Don't squeeze out the last air with force: a long exhale should be slow, not strained. If you feel dizzy, shorten both counts.