Breathing and posture

What works

Breathe through your nose by default, at rest, during sleep, and during easy exercise. Kelly Starrett makes this the anchor of respiratory health: nasal breathing improves gas exchange and carbon dioxide tolerance (Instagram, YouTube), and at night the simple cue is lips together, tongue on the roof of the mouth, with a dry mouth on waking as the tell-tale sign of mouth breathing (TikTok). Gray Cook links chronic mouth breathing to forward head posture as an airway-driven compensation (YouTube), and Neal Hallinan builds nearly every drill around a nasal inhale.

Good breathing expands the ribcage in all directions; the ribcage lifting straight up toward the ears is a dysfunction signature. Bill Hartman argues against strict belly breathing and coaches circumferential rib expansion instead (YouTube), Jordan Shallow makes the same case for lifters (Instagram), and Neal Hallinan describes proper mechanics as ribs expanding outward and backward on the inhale, warning that a ribcage shrugging toward the ears recruits the scalenes, SCM, and lower back as accessory breathing muscles (Instagram).

Stack the ribcage over the pelvis to brace, lift, and move well. Jordan Shallow ties glute and lat function directly to a stacked position (YouTube) and frames most glute activation problems as lumbo-pelvic stability problems (YouTube). Michelle MacDonald teaches the breath as the tool that creates intra-abdominal pressure for the brace, with the exhale completing the lift (Instagram). Neal Hallinan adds that the abdominals, especially the obliques and transverse abdominis, are what posteriorly tilt and stabilise the pelvis so breathing and rotation become possible (YouTube).

A long, complete exhale is the fastest lever on the nervous system. Kelly Starrett observes that stress shifts breathing toward a fast, upper-chest pattern with a roughly 1:1 inhale-to-exhale ratio, and that around 75 percent of anxiety and panic patients show dysfunctional breathing. Neal Hallinan's standard prescription is a nasal inhale, a full mouth exhale, and a 3 to 5 second pause at the bottom, typically 3 to 5 sets of 5 breaths (YouTube), and he cautions that deep breathing performed in spinal extension pushes the system toward fight-or-flight rather than vagal calm (YouTube). Joel Jamieson uses bear breathing, 2 sets of 5 breaths, to restore an exhalation-capable ribcage (YouTube).

Do not cue "sit up straight and pull your shoulders back" as a universal fix. Bill Hartman holds that posture is not broken and cannot be corrected by consciously sitting straighter; it changes when the body gains better movement options (Instagram, YouTube). Neal Hallinan agrees from the other direction: for someone whose lumbar spine is already over-arched, sitting up straight makes the pattern worse (YouTube), and he names systemic extension, a pelvis stuck forward with an arched lumbar spine, as the top driver of posture-related pain (YouTube).

Use positional breathing drills to restore ribcage and pelvis mechanics. Bill Hartman programs hook-lying and half-kneeling breathing with a soft nasal inhale and a prolonged exhale (YouTube). Neal Hallinan's cornerstone is the 90/90 hip lift, where feeling the proximal hamstrings anchor the pelvis is the success criterion (YouTube). Gray Cook uses breath cycles to unlock rotation range and tests whether an inhale or an exhale improves each exercise (Instagram).

For specific situations

• Children who mouth breathe deserve early attention: Kelly Starrett links habitual childhood mouth breathing to altered craniofacial development (YouTube).
• Asthma and exercise-induced bronchoconstriction: Starrett recommends nasal breathing during exercise and graded breath holds to build carbon dioxide tolerance (YouTube).
• Pregnancy and postpartum: Michelle MacDonald treats breathing mastery and a graded pelvic floor, worked like a "dimmer" from gentle activation to strength and power, as the foundation of return to training (Instagram).
• Hypermobile clients respond well to breathing work aimed at calming autonomic tension rather than stretching, with individualised feedback (Neal Hallinan, YouTube).
• Lifting in extension is acceptable in the moment if the athlete can exit that position afterward; living in extension is the problem (Neal Hallinan, YouTube).
• Archetype-based coaching: Bill Hartman tailors cues by infrasternal angle, a soft nasal inhale bias for narrow-angle bodies and a prolonged exhale bias for wide-angle bodies (YouTube); Joel Jamieson uses under 90 degrees at the infrasternal angle as the trigger for an exhalation-focused strategy (YouTube).

Open questions

• Can posture be trained directly? Jeff Cavaliere says yes: strengthen the weak muscles, stretch the tight ones, and reprogram the movement pattern (YouTube), with face pulls a few minutes per week as his signature tool (Instagram). Bill Hartman counters that posture is an output of available movement options, not a muscle imbalance to correct (YouTube). Gray Cook adds a third lens: if forward head posture is airway-driven, posture correction without fixing the breathing fails (YouTube).
• Anterior pelvic tilt blame. Bill Hartman explicitly rejects the popular "tight hip flexors and weak glutes" explanation (YouTube), a story Jeff Cavaliere's strengthen-and-stretch framework still leans on.
• Belly breathing. Hartman (YouTube) and Shallow (Instagram) both argue against the widely taught belly-only cue, preferring 360-degree expansion. No expert in this collection defends strict belly breathing, but it remains standard advice elsewhere, so treat the cue as superseded rather than settled.
• Left-right asymmetry models. Neal Hallinan's Postural Restoration framework, with its left-side sensory anchors, molar and heel pressure references, and rhythm-based methods, is internally consistent and rich in detail but comes almost entirely from one school of thought within this collection. Bill Hartman's infrasternal angle archetypes (YouTube) sit in a similar category: plausible, specific, and awaiting independent corroboration.

Cautions

• Most of the sensory-integration material here (molar pressure, ear plugging, eyeglass prescription changes, salsa rhythm work) traces to a single expert. Interesting, sometimes striking, but do not present it as consensus.
• Hallinan himself warns that autonomic and postural work of this kind is hard to self-administer and generic online programs often fail without skilled guidance (YouTube).
• Deep breathing practised in an extended, arched-back position can be counterproductive, driving sympathetic tone rather than calm (YouTube).
• A dry mouth on waking, snoring, or daytime mouth breathing are worth screening for before loading a posture program on top (Kelly Starrett, Gray Cook).

Putting it into practice

• Default to nasal breathing at rest, during sleep, and in zone 1 to 2 work; use lips-together, tongue-on-palate cueing and a morning dry-mouth check as the compliance signal.
• Screen breathing before programming posture work: BOLT score with 25 seconds or more as functional (Kelly Starrett), infrasternal angle under 90 degrees flagging an exhalation-strategy need (Joel Jamieson), and a visual check for the ribcage lifting toward the ears.
• Program one daily down-regulation block: 3 to 5 sets of 5 breaths, nasal inhale, long full exhale, 3 to 5 second pause at empty, in a hook-lying or 90/90 position with the low back quiet.
• Coach 360-degree rib expansion rather than chest-lift or belly-only breathing in all bracing and warm-up work.
• Brace lifts from a stacked ribcage-over-pelvis position, building pressure with the inhale and completing the effort on the exhale.
• Never issue a blanket "sit up straight, shoulders back" cue; for clients with an arched lumbar resting posture, bias toward exhale-driven, abdominal-supported positions instead.
• For persistent forward head posture, screen airway and mouth-breathing habits before adding corrective exercise volume.
• Use inhale-or-exhale testing within mobility drills: try the movement on each phase of the breath and keep whichever measurably improves range.

Experts in this guide: Instagram, TikTok, YouTube.

Before you act. Entrain is a free knowledge resource. It brings together what named doctors, scientists and coaches teach publicly, with sources, so you can explore and discuss it with your own clinician. It does not diagnose, treat or prescribe, and it is not a substitute for medical care.