Ask most parents what "tongue training" means and they'll picture something like a workout — push-ups for the tongue, building muscle mass until the speech sounds come out right. It's an intuitive idea. The tongue is a muscle; muscles get stronger with exercise; stronger muscles work better. The logic feels airtight.
It isn't. And a solid body of research over the past two decades shows exactly why the strength model misses the point — and what actually works instead.
The Landmark Finding: Strength Is Not the Issue
In 2018, Barker, Dodd, and Worrall published a systematic review of studies measuring tongue strength in children with speech sound disorders compared to their typically developing peers. The finding was striking: children with speech sound delays showed comparable tongue strength to age-matched controls. Their tongues were not weaker. The muscle itself was not the problem.
This finding has significant implications for how we think about speech exercises. If tongue weakness were the underlying cause of speech sound errors, then exercises targeting raw muscle force — pushing a tongue depressor, holding a sustained press against the palate — should improve speech. But the evidence for purely strength-based oral motor exercises as a route to better articulation is thin, a point Forrest (2002) made in an influential critical review that the field has taken seriously ever since.
What the research actually shows: Children with speech sound disorders produce weaker, less coordinated, and less precisely timed tongue movements — not weaker maximum force. The difference is in the control system, not the raw capacity of the muscle. This is a coordination and speed problem, not a strength problem.
What Actually Differs: Coordination, Speed, and Precision
Producing a clear /r/ or a precise /s/ requires the tongue to execute a specific movement within a window of approximately 50–100 milliseconds — while simultaneously coordinating with the lips, jaw, velum, and larynx, all of which are moving in parallel. The tongue doesn't need to be strong to do this. It needs to be fast, accurate, and tightly integrated with the rest of the speech production system.
Think of the difference between a weight lifter and a surgeon. The weight lifter maximizes force output. The surgeon maximizes precision, repeatability, and fine motor control under pressure. Speech is much more like surgery than weightlifting. What children with articulation difficulties need is not a stronger tongue — it is a more precisely programmed one.
Strand and Debertine (2000) demonstrated in their work on developmental apraxia of speech that exercises which pair movement with target sounds — rather than exercises that isolate the tongue from speech production — showed significantly better outcomes. The key insight is that the brain learns tongue movements as part of speech, not as abstract gymnastics divorced from language.
Why Isolated Tongue Holds Don't Transfer to Speech
Consider a common "oral motor" exercise: holding the tongue tip up behind the front teeth for a count of five. Is that an incorrect exercise? Not necessarily — there are contexts where building awareness of a target tongue position has value. The problem arises when the exercise stops there.
Holding a tongue position in isolation trains a sustained muscle contraction. But producing /t/, /d/, /n/, /l/, or /r/ correctly requires a dynamic tongue movement — a rapid tap, glide, or lateral placement executed in coordination with voicing and airflow. The neural motor program for "hold your tongue up for five seconds" is genuinely different from the neural motor program for "say /la-la-la/ quickly and clearly." Practicing one does not automatically build the other.
This is the core problem that Forrest (2002) and others identified with purely non-speech oral motor approaches: the transfer to speech production is not guaranteed and often doesn't happen. The muscle can do the hold; the speech motor program for the sound still needs to be learned separately through sound-targeted practice.
What This Means for Exercises: Sound-Paired Movement
The practical takeaway from this research is straightforward. Effective tongue training for speech purposes should:
- Pair tongue movements with target sounds. Moving the tongue to the alveolar ridge while producing /t-t-t/ in rapid succession builds the actual motor program for that sound, not just the muscle position.
- Prioritize speed and accuracy over force. Quick, precise repetitions — like a tongue-tap drill — train the fast-twitch coordination that speech actually requires.
- Progress from slow and deliberate to fast and automatic. Maas et al. (2008) describe this as moving from "performance" (consciously controlled, slow) to "learning" (automatic, fast, generalized). The goal of practice is to make the movement require less conscious effort over time.
- Use high repetition within sessions. Motor programs are built through repetition — not endless repetition of wrong patterns, but of correctly produced movements. Fifty or more correct trials per session is the meaningful threshold.
For parents: If your child's exercises involve holding tongue positions for long counts in silence, ask whether those exercises are also connected to sounds. The most effective exercises you can do at home are ones where your child is producing target syllables or sounds — not just holding a muscle position. Movement plus sound equals speech motor learning.
Agility Is the Goal
The reframe from "strength" to "agility" changes everything about how to practice. It means shorter, faster, more dynamic exercises beat longer, static holds. It means pairing every tongue position with a sound or syllable. It means playful, rapid-fire drills are not a dumbed-down version of real therapy — they are, in fact, closer to what the motor learning literature recommends.
Grimasso's exercise design is built around this principle. Every exercise pairs tongue movement with auditory and visual feedback on the target sound. The goal is not a stronger tongue. The goal is a more agile, precisely programmed one — and that's what changes how a child speaks.
References
- Barker, R. M., Dodd, B., & Worrall, L. (2018). Tongue strength in children with speech sound disorders: a systematic review. American Journal of Speech-Language Pathology, 27(4), 1372–1382. PMC6802864.
- Maas, E., et al. (2008). Principles of motor learning in treatment of motor speech disorders. American Journal of Speech-Language Pathology, 17(3), 277–298.
- Strand, E. A., & Debertine, P. (2000). The efficacy of integral stimulation intervention with developmental apraxia of speech. Journal of Medical Speech-Language Pathology, 8(4), 295–300.
- Forrest, K. (2002). Are oral-motor exercises useful in the treatment of phonological/articulatory disorders? Seminars in Speech and Language, 23(1), 15–25.
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