Most people struggle to spread their toes because the small muscles inside the foot have weakened from years of being compressed inside shoes, and because the brain has largely stopped sending detailed movement commands to individual toes. The problem is usually a combination of muscular atrophy, reduced neural control, and structural changes in the forefoot. The good news is that for many people the situation is reversible, though it takes consistent effort over weeks or months.
The Muscles You Have Never Trained
Your foot contains two groups of muscles. The extrinsic muscles originate up in the calf and send long tendons down into the foot, powering big movements like pointing your toes or pulling them upward. The intrinsic muscles live entirely inside the foot itself, packed between the bones and under the arch. These smaller muscles handle the fine-tuned work: spreading the toes apart, gripping the ground, and stabilizing the arch during walking and running. They play a central role in posture control and gait, help maintain both the lengthwise and crosswise arches, and regulate how much the arch deforms when you move.1PubMed Central. Ultrasound of the plantar foot: a guide for the assessment of plantar intrinsic muscles
The muscle most directly responsible for spreading your big toe away from the others is the abductor hallucis, which runs along the inner edge of your foot. A smaller muscle called the abductor digiti minimi does the same job for your little toe, pulling it outward. Between them sit the interosseous muscles, which spread and squeeze the middle toes. When these muscles weaken, the toes lose their independent movement and tend to bunch together or curl.
For most adults, these muscles are profoundly underused. Conventional shoes hold the toes in a fixed, tapered position for the majority of waking hours. Research comparing people who wear standard modern shoes with those who wear minimal footwear found that the conventionally shod group had significantly smaller abductor hallucis and abductor digiti minimi muscles even after adjusting for body size, along with reduced foot stiffness.2PubMed Central. Foot strength and stiffness are related to footwear use in a comparison of minimally- vs. conventionally-shod populations When a muscle is never asked to contract through its full range of motion, it atrophies just like any other muscle would.
Your Brain Has Forgotten How
Muscle weakness is only half the story. Even if your intrinsic foot muscles had adequate strength, your brain may no longer have a well-practiced motor program for spreading your toes. Think of how effortlessly you can spread your fingers wide. You have been doing that since infancy, and the motor cortex regions controlling your hand are large and finely mapped. Your toes have their own dedicated zones in the motor cortex too. Brain imaging studies show that when people imagine moving their toes, the corresponding foot areas of the primary motor cortex and supplementary motor area activate in a body-part-specific pattern.3PubMed. Imagery of voluntary movement of fingers, toes, and tongue activates corresponding body-part-specific motor representations The wiring is there. But neural pathways that rarely get used become less responsive over time, and the brain’s representation of the toes can shrink when those movement patterns go unpracticed.
This is not just a metaphor. Research on learning to voluntarily abduct the big toe found that people could develop the skill with practice, but that artificial feedback methods like EMG or force sensors were more effective than simply watching or feeling the toe move.4PubMed. Sensory feedback in the learning of a novel motor task In other words, many people cannot even tell whether their toe is actually moving on its own or whether another muscle is doing the work. The brain’s sensory map of the foot is blurry enough that you may need external cues to learn the movement. This is a skill acquisition problem layered on top of the muscular weakness, and it explains why someone can have relatively mobile toes in one foot and a nearly frozen forefoot on the other.
What Shoes Actually Do to Your Feet
People who grow up habitually barefoot develop measurably different foot shapes from people who grow up in shoes. Barefoot populations tend to have larger ball-of-foot perimeters, greater spacing between the big toe and the other toes, and a smaller hallux angle, meaning the big toe points straighter forward instead of angling toward the other toes.5Journal of Biomimetics, Biomaterials and Biomedical Engineering. Analysis of Foot Morphology in Habitually Barefoot Group These differences concentrate in the forefoot, exactly where conventional shoes apply the most compression. The spacing between toes also has functional consequences: in habitually barefoot people, forefoot pressure patterns are more sensitive to the distance between the big toe and the smaller toes, while shod people show almost no response to that same structural variable.6PubMed. Foot shape and plantar pressure relationships in shod and barefoot populations
The implication is that shoes do not just passively hold your toes together. They reshape the forefoot over years, changing bone angles, soft tissue tension, and how the muscles are loaded during walking. By the time you are an adult who has worn conventional footwear for decades, the structures of your forefoot have adapted to that constrained environment. Spreading your toes requires fighting against both the muscular weakness and the structural remodeling.
When It Is More Than Just Weakness
For some people, an inability to move the toes normally has a medical cause beyond simple disuse. Nerve entrapment syndromes in the foot and ankle can arise from trauma, anatomical variations, repetitive strain, or systemic conditions, producing symptoms like burning pain, tingling, and motor weakness depending on which nerve is affected.7PubMed Central. Overview of nerve entrapment syndromes in the foot and ankle Tarsal tunnel syndrome, for example, compresses the tibial nerve as it passes behind the inner ankle bone, and can weaken the intrinsic muscles it supplies. Morton’s neuroma, a thickening of tissue around a nerve between the toes, can cause numbness and pain that makes toe movement feel strange or impossible.
Less commonly, a neurological condition called focal dystonia can affect the foot. Dystonia causes involuntary muscle contractions that can curl or clamp the toes into abnormal positions. One documented case involved an adult woman whose symptoms began with difficulty moving her toes normally and progressed to painful cramping, toe curling, and instability while walking.8PubMed Central. Adult onset primary focal dystonia of the foot: an orthopaedic intervention Focal foot dystonia is rare, but if your toe immobility came on suddenly, is accompanied by involuntary curling or cramping, or affects only one foot in a dramatic way, it is worth getting evaluated by a neurologist.
Peripheral neuropathy from diabetes, alcohol use, or other causes can also degrade the nerve signals reaching the intrinsic foot muscles. When the sensory nerves are damaged, you lose the proprioceptive feedback that helps your brain coordinate toe movements. When the motor nerves are affected, the muscles themselves stop receiving adequate activation signals. If your inability to spread your toes is paired with numbness, tingling, burning, or balance problems, that combination points toward a nerve issue rather than simple disuse.
Structural Changes That Lock Toes in Place
Bunions and hammer toes are not just cosmetic problems. They physically change the mechanical relationships between bones, tendons, and muscles in ways that make toe spreading harder or impossible without intervention.
A bunion (hallux valgus) involves the big toe drifting toward the smaller toes while the first metatarsal bone angles outward, creating the characteristic bump. As this happens, the abductor hallucis muscle gets stretched into a position where it can no longer effectively pull the big toe away from its neighbors. The muscle’s line of pull shifts, so even if it contracts, it ends up flexing the big toe downward rather than spreading it sideways. This is why the abductor hallucis is considered the most important muscle in the development and progression of hallux valgus.9Applied Sciences. Which Is the Best Exercise for Abductor Hallucis Activation in Hallux Valgus? A Comparison Study for New Rehabilitation Perspectives
Hammer toes involve a similar kind of mechanical trap. In people with hammer toe deformity, researchers found that the ratio of extensor to flexor muscle strength in toes two through four was roughly two to three times higher than in people without the deformity.10PubMed Central. Muscle imbalance and reduced ankle joint motion in people with hammer toe deformity That imbalance means the muscles that pull the toes upward overpower the ones that press them down and stabilize them, bending the toe joints into a fixed, claw-like position. Once the toe is locked in that posture, trying to spread or flatten it becomes a battle against a structural deformity, not just a weak muscle.
Flat feet can compound the issue. When the intrinsic muscles that normally support the arch are weakened, the extrinsic muscles in the calf compensate by becoming thicker, while the plantar fascia thins out from altered loading.11PubMed. Ultrasound evaluation of foot muscles and plantar fascia in pes planus This cascade of compensation changes how forces are distributed through the forefoot during every step, further reducing the environment in which toe-spreading muscles would normally be active.
How to Test Whether Your Intrinsic Muscles Are Weak
Before launching into exercises, it helps to know where you stand. A few simple clinical tests can reveal whether your intrinsic foot muscles are actually firing or whether your extrinsic muscles are doing all the work.
The paper grip test involves placing a strip of paper under your toe and then trying to press the toe into the ground hard enough to hold the paper in place while someone pulls on it. If the paper slides out without tearing, your toe is not generating meaningful downward force, which suggests intrinsic muscle weakness.12PubMed Central. A New Clinical Test to Evaluate Intrinsic Foot Muscle Function A related test, the knuckle test, has you actively flex your toe joints: if the metatarsal heads (the bony knobs on top of your foot just behind the toes) become prominently visible when you try to curl your toes, that is a sign that the extrinsic muscles are dominating and the intrinsic muscles are not contributing properly.
These tests are imperfect. A systematic review of methods for measuring intrinsic foot muscle strength found that while techniques like hand-held dynamometry have excellent reliability, it remains unclear whether any clinical test can truly isolate intrinsic muscle strength from extrinsic muscle contribution.13PubMed Central. Importance and challenges of measuring intrinsic foot muscle strength Most clinical tests measure only toe flexion strength, and actions like toe extension and abduction have not been well assessed. Still, if you cannot pass the paper grip test or if your toes visibly curl rather than press flat when you try to grip, those are practical signals that your intrinsic muscles need work.
Exercises That Rebuild Toe Mobility
The single most studied exercise for restoring toe-spreading ability is the toe-spread-out exercise, sometimes called “short foot with toe splay.” You sit or stand with your foot flat on the ground and attempt to fan your toes apart while keeping them in contact with the floor. It sounds simple, and for most people it is humblingly difficult at first. The brain sends a command to spread, and either nothing happens or the toes curl instead.
An eight-week trial of the toe-spread-out exercise in people with mild to moderate bunions found that the exercise group significantly reduced their hallux valgus angle and increased the cross-sectional area of the abductor hallucis muscle, while a group using only orthoses showed no significant changes on any of those measures.14Journal of Physical Therapy Science. Effect of toe-spread-out exercise on hallux valgus angle and cross-sectional area of abductor hallucis muscle in subjects with hallux valgus That is a meaningful result: it shows that an atrophied abductor hallucis can regain size and function with targeted practice, and that the structural drift of a bunion can be partly reversed through muscular retraining alone.
Other exercises worth incorporating include:
- Towel scrunches: Place a towel on the floor and use your toes to pull it toward you. This trains the flexors but also activates the smaller stabilizing muscles.
- Marble pickups: Picking up small objects with your toes forces individual digit control and helps rebuild the neural pathways for independent toe movement.
- Big toe isolation: Press your four smaller toes into the ground while lifting only the big toe, then reverse the pattern. This trains the brain to differentiate between toe groups.
- Arch doming (short foot): While standing, try to raise your arch by pulling the ball of your foot toward the heel without curling the toes. This activates the intrinsic muscles that support the transverse and longitudinal arches.
Consistency matters more than intensity. Spending five to ten minutes a day on these exercises tends to produce noticeable improvements within four to eight weeks for people whose toe immobility comes from disuse rather than structural deformity. If you have a bunion or hammer toes, the exercises still help but progress will be slower and may plateau before full mobility is restored.
Do Toe Spacers and Minimalist Shoes Work?
Toe spacers are silicone or gel wedges placed between the toes, and they have become popular as a passive way to restore forefoot width. There is some clinical support for their use, particularly in people with bunions. A randomized controlled trial of custom-molded silicone toe separators found that after twelve months, the group wearing toe separators saw their hallux valgus angle decrease by about three degrees on average, while the control group’s angle worsened by about two degrees. Pain also decreased in the separator group.15PubMed. Effectiveness of the custom-mold room temperature vulcanizing silicone toe separator on hallux valgus: A prospective, randomized single-blinded controlled trial Personalized 3D-printed toe spreaders have also shown promise for symptom relief, though there is no consensus that any conservative approach can fully correct a bunion or halt its progression.16PubMed. The efficacy of shoes modification and orthotics in hallux valgus deformity: a comprehensive review of literature
Minimalist shoes take a different approach by removing the constraints that caused the problem. Shoes with thin, flexible soles and wide toe boxes allow the intrinsic muscles to work during normal walking. A study of primary school students who wore minimalist shoes to school daily found significantly increased cross-sectional area of the abductor hallucis and flexor digitorum brevis muscles, increased strength of the big toe and lesser toes, and improved arch height compared to a control group wearing conventional school shoes.17PubMed. Minimalist school shoes improve intrinsic foot muscle size, strength, and arch integrity among primary school students Research in adults has shown similar trends. Switching to minimal footwear should be done gradually, though, because weakened foot muscles and tendons need time to adapt to increased demand. Going from heavily cushioned shoes to flat, flexible ones overnight can cause stress injuries.
The combination of active exercise and environmental change (wider shoes, toe spacers, more barefoot time) probably works better than either alone. Exercises rebuild the specific neural pathways and muscle fibers needed for toe spreading, while wider footwear gives those muscles room to function during the hours you are not actively training them.
What Athletes and Barefoot Movers Can Teach Us
Toe strength and mobility are not abstract concerns limited to rehabilitation clinics. Athletes who regularly load their feet without the cushioning of standard athletic shoes develop measurably different foot musculature. A study comparing gymnasts, cheerleaders, and non-athletes found that gymnasts had roughly 24 percent greater total intrinsic foot muscle size than non-athletes, and cheerleaders had about 14 percent more. Cheerleaders also generated 40 percent more lateral toe-flexion force than non-athletes.18PLOS ONE. Sticking the landing: A comparison of shod vs barefoot landing kinetics and foot muscle characteristics in gymnasts, cheerleaders, and non-athletes Gymnastics in particular involves extensive barefoot work on hard surfaces, and that loading stimulus appears to drive substantial intrinsic muscle development.
These findings reinforce a principle that extends beyond competitive sports: the foot adapts to the demands placed on it. If those demands include spreading, gripping, and balancing on an unshod foot against a hard surface, the muscles grow and the neural control sharpens. If the demands are limited to passive support inside a cushioned shoe, the muscles atrophy and the brain’s motor map of the toes fades. The foot is not a static structure. It is as trainable as a forearm or a shoulder, just vastly more neglected.
The Evolutionary Context for Stiff, Bunched Toes
Human feet evolved as a compromise. Our distant ancestors had feet that functioned more like hands, with a grasping big toe used for climbing. Over millions of years, the human foot traded most of that prehensility for features suited to long-distance walking and running: a stiff arch capable of storing elastic energy, a big toe aligned with the other toes for push-off, and a rigid midfoot that acts as a lever.19Journal of Experimental Biology. Rethinking the evolution of the human foot: insights from experimental research We kept the intrinsic muscles for balance, fine-tuning ground contact, and stabilizing the arch, but the gross prehensile function was largely sacrificed.
This means there is a natural ceiling on how much toe independence a human foot can achieve. You will never spread your toes with the same dexterity as your fingers, because the bones, joints, and muscles are not built for that degree of articulation. But the gap between what most shoe-wearing adults can do and what the human foot is actually capable of is enormous. People who grow up barefoot routinely demonstrate wide toe splay, independent big-toe movement, and forefoot dexterity that would seem impossible to someone who has worn narrow shoes their whole life. The limitation is not evolutionary. It is environmental and reversible.
Sensory Training and the Foot-Brain Connection
Rebuilding toe mobility is not purely a muscular project. The sensory side matters as well. Your foot’s skin is packed with receptors that detect pressure, texture, and vibration, feeding the brain a constant stream of information about the surface beneath you. When that sensory input is muffled by thick-soled shoes for years, the brain’s ability to process foot-related information degrades.
Training the sensory system of the foot can sharpen this connection. A study comparing different types of foot somatosensory training found that a discrimination training protocol, where participants practiced distinguishing textures or points of contact on the sole, produced significantly greater improvements in two-point discrimination ability than control or attention-only groups.20Cureus. Effects of Foot Somatosensory Training on Plantar Somatosensory Function Two-point discrimination is the ability to distinguish between one and two simultaneous touch points on the skin, a rough proxy for how finely the brain maps that body region. A sharper sensory map makes it easier for the brain to direct precise motor commands to the toes, because it can “see” each toe more clearly in its internal body model.
Practical ways to incorporate sensory training include walking barefoot on varied surfaces (grass, gravel, sand, textured mats), rolling a small ball under the sole of the foot while paying close attention to the sensations, and practicing picking up objects of different shapes with the toes. These activities do not directly strengthen the toe-spreading muscles, but they improve the neural infrastructure that supports voluntary toe control. Paired with the active strengthening exercises discussed earlier, sensory work can accelerate the timeline for regaining toe mobility.