We recommend pursed-lip breathing.

It allows a longer exhale channel by creating positive pressure in the airways, which helps keep them open longer, removes trapped air, and relieves shortness of breath.

This technique involves inhaling slowly through the nose and exhaling slowly through the mouth with puckered lips, making the exhalation last twice as long as the inhalation

Breathe in through your nose and breathe out slowly, yet firmly, through pursed lips – as if you're blowing out a candle. 

The egg biosensor measures your breathing frequency and rhythm - which our games guide you to slow down, and parasympathetic response and tone.

You'll find more information there. 

Your breathing frequency is assessed through your respiratory rate (RR), expressed in Hertz - breathe in, breathe out, possibly hold and pauses.

Your breathing rhythm is your inhale-to-exhale ratio (I:E). 

To evaluate your parasympathetic response, we leverage the power of heart rate variability (HRV).

HRV is more than just measurements like RMSSD or SDNN. Advanced analytical mathematical models capture irregularities, reveal adaptive responses, while machine learning models help refine predictive analysis.

To summarize, HRV is not just “how much it varies”—it’s the patterns of variation, revealing how the nervous system adapts under load.

By the way, most smartwatches, rings, and apps assume 'higher is better' for HRV: this is a misleading simplification of physiological dynamics. 

This is why we emphasize accuracy by collecting high-resolution raw data and following a rigorous protocol where measurements are intentionally taken within a well-defined context – breath-controlled games.

In addition, how you interact with a game with the egg allows to evaluate your ability to concentrate on breathwork - cognitive load.

0.1 Hz breathing, i.e., 4-second inhalation (breathing in) and 6-second exhalation (breathing out) activates your PNS.

Neurophysiology explains how controlled breathing stimulates your PNS:

- Your heart rate naturally increases as you inhale and decreases as you exhale. This phenomenon is called respiratory sinus arrhythmia (RSA) and is a marker of parasympathetic tone

- Baroreceptors are specialized pressure-sensitive sensors located within the arteries that continuously monitor blood pressure levels. When blood pressure rises, these receptors transmit signals to the brain, prompting an increase in parasympathetic nervous system activity, which in turn slows the heart rate. This regulatory mechanism typically functions at a frequency of around 0.1 Hz

- During 0.1 Hz slow breathing, respiratory sinus arrhythmia and baroreflex-driven heart rate oscillations align in phase, producing a large, regular rhythm known as resonance or cardiac coherence. This synchronized pattern reflects maximal coupling between breathing, heart rate, and blood pressure regulation around the individual’s resonance frequency

- At approximately 0.1 Hz, phase‑locked coherence markedly increases HRV and augments baroreflex sensitivity, indicating stronger vagal modulation of cardiac rhythms. This amplified vagal influence engages the parasympathetic system and supports a calm, relaxed physiological state.

Essentially, you are hacking the brain-body connection to enhance PNS response and therefore further support your efforts to get and stay healthy. 

For meaningful insights and extended effect, use the egg daily - keep your streak alive.

Can we tell you something?

When you're starting out with breathwork, the guidance is often broad: “Aim for 5-10 minutes a day, 5 days a week.”

It’s a helpful baseline, but it’s also a blanket recommendation that doesn’t account for your unique physiology, goals, or progress.

But the moment you introduce physiological measurement, your practice transforms. You’re no longer just clocking hours; you’re tuning your effort to match your intention.

Measurement turns breathwork from a routine into a feedback loop. And with data in hand, you begin to adjust. It’s the difference between guessing and knowing. Between hoping and evolving. Because what you can measure, you can manage. And what you manage, you can master.

Repeated measurements of your own digital biomarkers (breathing, parasympathetic) allows to continuously analyze how these markers change aover time, providing a highly dynamic understanding of your ever-changing parasympathetic response and adaptability, compared to single-time point or randomized measurements.