Where is your mind right now?
How does your body feel?
Open, sheltered, wild, or deep?
Rest.
Each has a different physiological mechanism. Pick a duration. Niwa handles the sequence.
Deflates collapsed alveoli. The long exhale activates the vagus nerve. Fastest known technique for reducing acute anxiety.
Balban et al. (2023) — outperformed mindfulness meditation for anxiety reduction over 4 weeks of daily 5-minute practice.
At 6 breaths per minute, heart rate and breathing synchronise. This is HRV coherence — the nervous system's reset switch. Effect is noticeable within minutes.
Lehrer & Gevirtz (2014) — coherence breathing reliably improves heart rate variability and reduces physiological stress markers.
The holds activate the prefrontal cortex, temporarily overriding the amygdala threat response. Trains the nervous system to tolerate physiological sensation without reacting.
Used by US Navy SEALs and emergency responders. Consistent with established CO₂ tolerance and vagal tone physiology.
The 7-second hold builds CO₂ tolerance. The 8-second exhale extends parasympathetic activation by approximately 40% versus equal-ratio breathing.
Developed by Dr Andrew Weil. Most demanding technique in Niwa — appears only at the close of 4-minute sessions, after the nervous system has already been settled.
Humming generates nitric oxide in the sinuses — a vasodilator that improves oxygen delivery and directly stimulates the vagus nerve. A uniquely physiological mechanism.
2024 systematic review of 46 studies — significant reductions in anxiety and heart rate. Nitric oxide effect not shared by any other breathing technique.
Alternating nostrils cross-activates brain hemispheres. Left nostril (right hemisphere) increases parasympathetic tone; right nostril increases sympathetic. The result is bilateral regulation.
Telles et al. (2013) + 2024 systematic review — superior blood pressure reduction and bilateral cortical activation versus unilateral techniques.
Niwa is a free, browser-based breathing tool made by Kōjō. Choose how long you have — from one minute to thirty. Answer three questions about how you feel. A breathing guide sequences the rest. No account. No app. No data collected.
The techniques are evidence-based: cyclic sighing, coherence breathing, box breathing, 4-7-8, bhramari, and nadi shodhana. Each is drawn from published research and produces a measurable physiological effect. The session adapts to your answers — a different environment, a different sequence — calibrated to the moment rather than generic.
It was built for people who want a grounded daily practice without the overhead of a meditation app. It works mid-morning before focus drops, mid-afternoon when it already has, and in the evening as a way to wind down deliberately.
Each has a different physiological mechanism and a different rhythm. They are not interchangeable, and the evidence on which technique does what is specific enough that choosing randomly would leave most of that on the table. Niwa sequences them by session length — you pick how long you have, it handles the rest.
Two inhales through the nose — a full breath, then a short top-up to fully expand the lungs — followed by a long, slow exhale through the mouth. One cycle takes roughly nine seconds. A 2023 randomised controlled trial by Balban et al., published in Cell Reports Medicine, found cyclic sighing more effective than mindfulness meditation for reducing anxiety and improving positive affect across four weeks of daily practice. Niwa uses it at the start of every session.
Five seconds in, five seconds out. At this rhythm — approximately six breaths per minute — heart rate and breathing synchronise naturally, producing what researchers call heart rate variability (HRV) coherence. Sustained coherence practice is associated with reduced cortisol and improved stress regulation. It is the most accessible technique here: the pattern is simple to hold and the effect is noticeable within minutes. The wider evidence base is in the Kōjō foundations.
Four seconds inhale. Four seconds hold. Four seconds exhale. Four seconds hold. The pattern forms a square — which is where the name comes from. Box breathing is used by the US Navy SEALs and emergency responders as an active stress-regulation tool under pressure. The holds train the nervous system to tolerate physiological sensation without triggering a stress response — which has value beyond the session itself.
Four seconds inhale through the nose. Seven seconds hold. Eight seconds exhale through the mouth. Developed by Dr Andrew Weil as a sleep and anxiety protocol, the extended hold and prolonged exhale strongly activate the parasympathetic nervous system. It is the most demanding technique in Niwa and appears only at the close of four-minute sessions, after the nervous system has already been settled by the preceding phases.
Four seconds inhale, followed by a slow humming exhale lasting seven seconds — mouth closed, sound resonating in the nasal cavity. A 2024 systematic review of 46 studies found bhramari produces significant reductions in anxiety and heart rate. The vibration of humming also generates nitric oxide in the sinuses, which has measurable effects on nasal airflow and vagal tone. Niwa uses bhramari as the closing technique in five-minute sessions, after coherence and box breathing have already begun to lower the physiological baseline.
Breathing alternately through left and right nostrils in a structured rhythm — in through the right, hold, out through the left, then in through the left, hold, out through the right. A 2024 systematic review confirmed superior blood pressure reduction compared to unilateral breathing techniques, and bilateral cortical activation across both brain hemispheres. Left nostril breathing increases parasympathetic tone; right increases sympathetic. The result is whole-brain regulation — a state of alert calm. Nadi Shodhana appears only in Niwa's 20 and 30-minute sessions, after extended coherence practice has already established the required baseline. It is the most demanding technique and the most complete.
Most mornings have a window — the coffee, the few minutes before the first notification, the gap before the day takes over. That window is shorter than it needs to be, and usually less deliberate than it could be.
Three minutes is enough to shift your physiological baseline before the first meeting. Twenty minutes, consistently, rebuilds how you regulate over time. Niwa sits inside whatever morning ritual you already have — open it, answer three questions, breathe, continue. More on building a consistent morning practice in the The Kōjō Journal.
For those who take Rōnin Daily Formula — the supplement works with your physiology over time. A breathing practice produces a different and more immediate effect: a calmer nervous system within minutes, compounding over sessions. Neither requires the other. The reasoning behind how they work together is in why Kōjō.
The cyclic sighing data comes from a randomised controlled trial: Balban et al. (2023), Cell Reports Medicine. It tested cyclic sighing, box breathing, and mindfulness meditation in daily five-minute sessions across four weeks. Cyclic sighing produced the greatest reduction in anxiety and the greatest improvement in positive affect of the three conditions.
Coherence breathing's effect on heart rate variability has been extensively studied. The Mayo Clinic references slow diaphragmatic breathing as an established tool for stress and anxiety management. The 4-7-8 technique is less studied in published clinical trials but is consistent with the established physiology of extended exhalation and controlled breath-holding.
Niwa does not make medical claims. It is a tool for people who want to use their breath more deliberately. If you are managing a clinical condition, these techniques are complementary, not therapeutic. The full research context is in the foundations of deliberate daily practice.
Kōjō makes a daily supplement and a breathing tool. They are not the same thing, but they work through overlapping physiology — which is why the combination is more coherent than either alone.
Magnesium and HRV. Magnesium glycinate — included in the formula for its superior bioavailability — supports heart rate variability and sleep quality through the regulation of NMDA receptors in the nervous system. Coherence breathing (5s in, 5s out) independently raises HRV through vagal activation. These are additive effects: the mineral supports the substrate; the practice trains the response. Magnesium deficiency is associated with reduced HRV and impaired stress recovery — which is worth knowing if you find breathing practice less effective on days when your diet has been poor.
L-theanine and the state that breathing creates. L-theanine promotes alpha wave activity — a neural state associated with calm alertness rather than sedation. A 5-minute cyclic sighing or coherence session produces a similar phenomenological outcome: reduced physiological arousal without reduced alertness. L-theanine taken before a session may extend the duration of that state rather than merely enhance it. This has not been tested as a combination in published research, but the mechanisms are non-competing and the logic is sound.
None of this is required reading. Niwa works without the formula, and the formula works without Niwa. But if you are doing both, it is worth understanding why they fit.
Niwa is free. It will always be free. It works offline. It has no account. It stores nothing on a server.
This is not a strategy — it is what a breathing tool should be. No friction. No paywalls. No account required. No data collected. A practice that belongs to you from the first session.
Niwa is how Kōjō demonstrates what it believes: that the tools most useful for daily performance should not have friction, paywalls, or data collection attached to them. The supplement funds the company. Niwa demonstrates the philosophy.
Niwa is a free breathing tool by Kōjō