Cortisol+ Guided Breathing: What the Exercise Does

Follow the Cortisol+ breathing timer and understand its limits. A completed session or HRV change does not prove that cortisol fell.

Updated September 9, 2026 · By Cortisol+ Editorial

A short guided breathing exercise

Cortisol+ includes an animated breathing exercise with prompts, a cycle counter and an option to end early. It offers a structured pause you can follow on screen. It does not test cortisol before or after the session.

What is included

The iPhone exercise reviewed for this guide uses three repeating phases: breathe in, hold and breathe out, each lasting four seconds. Eight cycles take about 96 seconds. The start screen calls this “4-4-4 box breathing”; this implementation does not include a fourth hold after the exhale.

  1. Open the breathing exercise and select Begin.
  2. Follow the expanding and contracting circle and the phase prompts at a pace that is comfortable for you.
  3. Use End Early if you want to stop. The completion screen lets you close the exercise.

This describes the implemented exercise reviewed September 9, 2026. We have removed earlier website claims about four selectable protocols and automatic before-and-after hormone measurements because those claims were not supported by the reviewed implementation.

What a session result can tell you

Completing the timer records that you used the exercise. It does not show that stress, heart rate or cortisol changed by a promised amount. If you review a wearable reading afterward, check its timestamp: the latest available sample may predate the exercise.

Notice how the exercise feels without treating a score as proof of success. There is no established Cortisol+ result that every user should reach after one session or several weeks.

How breathing fits with wearable tracking

You can keep a note that you tried the exercise and compare it with your own sleep and routine records. This is an observation, not a controlled experiment. A change on the same day cannot establish that breathing caused it.

Explore HRV stress monitoring, sleep tracking and the full scoring methodology. App access depends on the feature and the current subscription or trial offer.