1. Introduction: Could the Tongue and Feet Be Connected?

The tongue and toes appear to have very different jobs. The tongue helps with speaking, swallowing and eating, while the feet support standing, walking, running and jumping.

Yet, when we study the human body, we discover that muscles, connective tissues, sensory systems and movement strategies do not function entirely in isolation.

This raises an interesting question: Could the position of the tongue, the way a child breathes and the way they move be related?

One anatomical model used to explore this question is the Deep Front Line (DFL), a proposed myofascial pathway described in Thomas Myers’ Anatomy Trains. It connects deep structures around the feet and lower legs with the inner thighs, pelvis, diaphragm and deep neck region.

However, there is an important distinction between identifying anatomical connections and proving that an intervention at one end of the body will produce predictable changes at the other.

Current research supports some aspects of myofascial continuity, but evidence for the complete Deep Front Line and its proposed clinical effects remains limited and variable.

In children, the most useful starting point is therefore not to assume that tongue posture controls foot mechanics or behaviour. It is to understand how breathing, sleep, oral function and movement may interact — and when a professional assessment is appropriate.

2. What Is the Deep Front Line?

The Deep Front Line is a proposed anatomical and movement concept used in some manual therapy, movement education and myofascial approaches.

It describes a pathway through several deep muscular and connective tissue structures.

The proposed pathway

A. Head and neck region

The tongue, muscles beneath the tongue and deep neck structures participate in oral function, swallowing, head control and airway-related activity.

The tongue receives motor and sensory innervation from several cranial nerves. These nerves have different functions, including controlling tongue movement and transmitting sensation.

B. Thoracic region and diaphragm

The diaphragm is the primary muscle of inspiration. It works alongside the rib cage, abdominal wall and other respiratory muscles to support breathing.

Breathing also interacts with trunk pressure management and postural control, particularly during physical activity.

C. Pelvis and inner thigh

Deep hip and pelvic muscles, including the psoas, iliacus and adductor group, contribute to hip movement and pelvic control.

Their function is influenced by task demands, strength, mobility, coordination and the nervous system.

D. Lower leg and foot

The tibialis posterior helps support the medial foot arch and contributes to foot movement. The flexor hallucis longus and flexor digitorum longus help flex the toes and contribute to foot function during walking and running.

These muscles receive sensory information from the lower limb and contribute to movement control.

What does the evidence tell us?

Anatomical research supports the existence of many local fascial connections. However, a proposed line linking all these structures should not automatically be interpreted as a single, uninterrupted cable that transmits clinically meaningful tension from the tongue to the toes.

A 2025 review of myofascial continuity reported variable evidence across different proposed fascial lines, with the Deep Front Line receiving limited to moderate support for selected transitions rather than definitive validation of the entire pathway.

Reference: Myofascial continuity: Review of anatomical and functional evidence — PubMed

The practical lesson is simple: the body is interconnected, but the significance of each connection must be tested rather than assumed.

3. Tongue Posture, Breathing and Sleep

One of the more clinically relevant areas to investigate is the relationship between oral function, breathing and sleep.

What is resting tongue posture?

Resting tongue posture describes where the tongue sits when a person is not speaking, eating or swallowing.

In a typical oral resting pattern, the lips may be comfortably closed, the tongue may rest against the palate and breathing may occur through the nose when the nasal airway is clear.

However, resting posture varies between individuals. Tongue position alone cannot establish whether a child has an airway obstruction, a swallowing problem or a particular medical condition.

Why nasal breathing matters

Nasal breathing filters, warms and humidifies inhaled air. Nasal passages also produce nitric oxide, which has physiological roles in the respiratory system.

But it is important not to overstate these effects. Nasal breathing does not guarantee adequate oxygenation, and tongue positioning exercises cannot be assumed to improve oxygen delivery or whole-body recovery in every child.

Persistent mouth breathing may occur for several reasons, including:

• Nasal congestion or allergies.
• Enlarged adenoids or tonsils.
• Structural differences affecting the nasal airway.
• Habitual oral breathing patterns.
• Certain oral, dental or neuromuscular factors.

If a child regularly breathes through their mouth, the priority is to understand why rather than simply instructing them to keep their lips closed.

The relationship between sleep and behaviour

Sleep is important for attention, learning, emotional regulation and physical recovery.

Some children with sleep-disordered breathing experience habitual snoring, restless sleep, pauses in breathing or daytime behavioural difficulties.

The American Academy of Pediatrics recommends that children be evaluated when symptoms suggest obstructive sleep apnoea. Snoring accompanied by breathing difficulty, gasping or disturbed sleep deserves particular attention.

Source: American Academy of Pediatrics — Diagnosis and Management of Childhood Obstructive Sleep Apnea Syndrome

This does not mean that mouth breathing causes ADHD. Sleep disorders and ADHD can have overlapping symptoms, and a child may have either condition or both. Behavioural concerns require appropriate clinical assessment.

Source: CDC — Is it ADHD?

4. Can Tongue Position Change the Way a Child Breathes?

Tongue muscles contribute to the function of the oral cavity and upper airway. In selected patients, orofacial myofunctional therapy (OMT) may be used to address specific oral-motor patterns as part of a broader treatment plan.

OMT can include professionally prescribed exercises targeting tongue movement, lip function, swallowing patterns and oral resting posture.

However, three distinctions matter.

First, an exercise is not the same as a diagnosis. A child with a tongue-mobility restriction, enlarged tonsils or nasal obstruction may require a different assessment and treatment pathway.

Second, improving a movement pattern does not necessarily resolve the underlying cause. For example, practising a tongue position will not remove enlarged adenoids or treat every cause of sleep-disordered breathing.

Third, the evidence is still developing. A 2024 systematic review and meta-analysis found benefits from OMT in adults with obstructive sleep apnoea, but the single paediatric randomised trial included in that review did not demonstrate improvements in the measured sleep outcomes. More recent paediatric reviews have also highlighted limited evidence, differences between studies and uncertainty about treatment effectiveness.

Sources:

• Orofacial Myofunctional Therapy for Obstructive Sleep Apnea — The Laryngoscope
• 2026 systematic review of myofunctional therapy in paediatric obstructive sleep apnoea

OMT may be appropriate for selected children when guided by qualified professionals. It should not be presented as a universal treatment for breathing problems, emotional dysregulation or ADHD.

5. The Diaphragm, Breathing and Nervous System Regulation

Breathing is both automatic and voluntarily adjustable. A child can change breathing rate and depth during exercise, relaxation, speech and other activities.

Slow, comfortable breathing may help some people manage stress and arousal. Breathing also interacts with autonomic regulation, which involves the sympathetic and parasympathetic branches of the nervous system.

However, the mechanism is more complex than a simple switch between “fight-or-flight” and “rest-and-digest”.

The diaphragm is not directly controlled by tongue position through a proven, continuous mechanical pathway. Although the tongue, neck, thorax and diaphragm participate in related physiological functions, it has not been established that correcting tongue posture reliably restores diaphragmatic breathing or produces a specific autonomic response in children.

What can practitioners reasonably assess?

A suitable assessment may consider:

• Whether breathing appears comfortable at rest.
• Whether the child habitually breathes through the nose or mouth.
• Rib-cage and abdominal movement during quiet breathing.
• Whether breathing changes during exercise or tasks requiring trunk control.
• Whether the child reports breathlessness or discomfort.
• Whether sleep-related symptoms warrant medical referral.

These observations can help identify questions that need further assessment. They do not independently diagnose airway disease or nervous system dysfunction.

6. How Does This Relate to Foot Arches, Toe-Walking and Posture?

The foot provides a base of support for many everyday activities. Foot arch behaviour, ankle mobility, lower-limb strength, balance and coordination can influence movement strategies.

Similarly, head position, trunk control, hip function and breathing mechanics may influence how a child organises movement during different tasks.

But an observed combination of forward head posture, mouth breathing and flat feet does not prove that all three arise from tension in the Deep Front Line.

Understanding toe-walking

Toe-walking can occur for several reasons, including developmental patterns, calf muscle tightness, neurological conditions or other musculoskeletal factors.

Persistent toe-walking, pain, asymmetry, reduced ankle movement or a change in walking pattern warrants assessment by an appropriate healthcare professional.

Understanding a flattened foot arch

A lower-looking arch is not automatically a problem. Some children have flexible flat feet without pain or functional limitations.

Assessment becomes more important when the child experiences pain, fatigue, difficulty participating in activities, restricted movement or other concerning findings.

What should a movement assessment include?

Depending on the child's age and symptoms, an assessment may include:

• Foot posture and arch behaviour during standing and movement.
• Ankle mobility and calf function.
• Single-leg balance and lower-limb control.
• Hip and trunk movement during functional tasks.
• Walking, running or jumping mechanics when relevant.
• Pain, activity limitations and developmental history.

The purpose is to identify the child's actual movement needs, not to attribute every finding to one anatomical chain.

7. A Practical Example: An Eight-Year-Old Who Struggles to Sit Still

Consider a hypothetical child who frequently moves around during class, appears tired after school and walks on their toes.

Their parents also report mouth breathing, snoring and restless sleep.

A whole-child approach would consider several possible contributing factors rather than assume one cause.

Step 1: Explore the sleep history.

Ask about habitual snoring, gasping, pauses in breathing, restless sleep and daytime tiredness. Refer to a paediatrician or appropriate medical professional if symptoms raise concern about sleep-disordered breathing.

Step 2: Assess oral and airway concerns.

A paediatrician or ear, nose and throat specialist can evaluate possible airway issues. A qualified speech-language therapist or orofacial myofunctional therapist may assess oral-motor function when appropriate.

Step 3: Assess movement.

A physiotherapist can evaluate ankle range of motion, calf function, balance, walking pattern, foot mechanics and other relevant movement findings.

Step 4: Coordinate the plan.

Recommendations should reflect the findings of each relevant professional. Depending on the child's needs, this may involve medical management, specific oral-motor therapy, movement-based rehabilitation or other support.

Step 5: Monitor meaningful outcomes.

Track changes that matter to the child, such as sleep quality, pain, walking comfort, participation in play and functional movement.

This example illustrates how different factors can be considered together. It does not establish that the tongue, fascial chains or foot posture caused the child's behavioural difficulties.

8. Common Myths and Facts

9. Assessment and Individualisation: What Should Parents Look For?

A useful assessment begins with the child's symptoms, history and everyday function.

It should not begin with the assumption that every child needs tongue exercises or correction of a presumed fascial restriction.

Medical and oral-function considerations

Seek appropriate assessment if a child has persistent mouth breathing, frequent snoring, gasping during sleep, suspected pauses in breathing, difficulty swallowing or concerns about tongue mobility.

Depending on the findings, the healthcare team may include a paediatrician, ENT specialist, dentist or orthodontist, speech-language therapist and other relevant professionals.

Movement and physical-function considerations

A physiotherapist may assess:

• Posture during relevant functional activities.
• Foot and ankle mobility.
• Lower-limb strength and control.
• Balance and coordination.
• Walking, running and jumping patterns.
• Pain and limitations in sport or play.

Behaviour and attention considerations

If concerns about attention, impulsivity or emotional regulation persist across home, school or other settings, discuss them with a paediatrician or qualified child mental-health professional.

Sleep problems should be considered when relevant, but should not be used to dismiss or replace an appropriate ADHD evaluation.

The goal is not to find one explanation for every symptom. It is to identify the factors that are relevant to the individual child and act on them appropriately.

10. Frequently Asked Questions

1. Are the tongue and toes anatomically connected?

The body contains interconnected muscles and connective tissues. The Deep Front Line is a proposed myofascial model that links selected structures from the feet and lower legs through the pelvis and diaphragm to the neck and tongue region. Evidence for the complete pathway and its clinical significance remains limited.

2. Can tongue exercises calm a hyperactive child?

Tongue exercises should not be prescribed as a general treatment for hyperactivity. If a child has a specific oral-motor or sleep-related breathing concern, a qualified professional can determine whether myofunctional therapy is appropriate. Persistent behavioural concerns require their own assessment.

3. What is the palatal spot?

The term commonly refers to the area of the hard palate just behind the upper front teeth. It is often used when teaching oral resting posture. Exercises involving this area should be individually appropriate, particularly when a child has pain, restricted tongue movement or swallowing difficulties.

4. Can foot exercises improve tongue posture?

There is insufficient evidence to conclude that foot exercises reliably change tongue posture or resolve oral-motor problems. Foot exercises should be selected for the child's actual foot, ankle, balance or movement needs.

5. Should parents worry if their child breathes through their mouth?

Occasional mouth breathing can occur during colds or nasal congestion. Persistent mouth breathing, especially when accompanied by habitual snoring, gasping or disturbed sleep, deserves medical evaluation.

6. Which professional should parents consult first?

For persistent mouth breathing or sleep-related breathing concerns, start with a paediatrician or appropriate medical professional. An ENT specialist may be needed to evaluate the airway. For movement difficulties, consult a qualified paediatric physiotherapist. Other professionals can be involved when specific oral-motor or developmental needs are identified.

7. Does the Deep Front Line explain every postural problem?

No. Posture and movement reflect many interacting influences, including anatomy, strength, mobility, coordination, development, habits, task demands and symptoms. A single fascial model cannot explain every presentation.

11. Key Takeaways

• The tongue, respiratory system, trunk, pelvis and feet all contribute to different aspects of human function.
• The Deep Front Line is a proposed anatomical model, not a proven mechanism that explains all whole-body movement or behavioural differences.
• Persistent mouth breathing and sleep-related breathing symptoms deserve appropriate medical assessment.
• Sleep difficulties can overlap with attention and behavioural concerns, but they do not automatically establish or rule out ADHD.
• Orofacial myofunctional therapy may be relevant to selected patients, but evidence for paediatric sleep outcomes remains uncertain.
• Foot posture and toe-walking should be assessed according to symptoms, function, development and individual findings.
• A multidisciplinary approach can be valuable when a child has concerns involving sleep, oral function and movement.

12. The Sports2Science Perspective

At Sports2Science, we believe that good assessment begins with understanding the individual rather than relying on a single observation or theory.

Movement, posture, breathing and physical performance involve multiple interacting systems. Looking at these systems together can help practitioners ask better questions and develop more appropriate recommendations.

However, a whole-body approach must also be an evidence-based approach. Anatomical connections can generate useful hypotheses, but clinical decisions should be guided by the child's symptoms, assessment findings and the strength of available research.

Through functional movement assessments, posture screening and biomechanical evaluation, Sports2Science aims to help individuals understand their movement patterns and identify practical areas for improvement. When concerns fall outside the scope of movement assessment, appropriate referral and collaboration with other healthcare professionals are essential.

Final Thought: Connected Does Not Always Mean Causally Linked

The human body is interconnected, and understanding those connections can broaden the way we approach movement and health.

The relationship between oral function, breathing, sleep and movement is worth exploring — particularly when a child experiences several concerns at once.

But the most responsible approach is to distinguish anatomical possibility from demonstrated clinical benefit. No single tongue position, fascial pathway or movement test can explain every child's posture, sleep or behaviour.

Assess the whole child. Interpret findings carefully. Individualise the plan.

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Scientific References

1. Kalichman, L. (2025). Myofascial continuity: Review of anatomical and functional evidence. Journal of Bodywork and Movement Therapies. PubMed
2. Saba, E. S., et al. (2024). Orofacial Myofunctional Therapy for Obstructive Sleep Apnea: A Systematic Review and Meta-Analysis. The Laryngoscope. PubMed
3. Avivar-Pardo, R., et al. (2026). Effectiveness of myofunctional therapy on polysomnographic and functional outcomes in paediatric obstructive sleep apnea: A systematic review. Sleep and Biological Rhythms. Publisher
4. American Academy of Pediatrics. Diagnosis and Management of Childhood Obstructive Sleep Apnea Syndrome. Pediatrics. Clinical practice guideline
5. Centers for Disease Control and Prevention. Is it ADHD? CDC
6. Myers, T. W. (2020). Anatomy Trains: Myofascial Meridians for Manual and Movement Therapists (4th ed.). Elsevier.