{"schemaVersion":1,"id":"en-movement-walking","type":"movement","pillar":"movement","locale":"en","translationGroupId":"movement-walking","slugPath":"movements/walking","title":"Walking","shortTitle":"Walking","summary":"The most frequent movement of the human body, and the least described. One step involves some twenty muscles whose main work is braking, and a balance problem nothing signals.","level":"beginner","estimatedMinutes":8,"synonyms":["walking","gait","gait cycle","stride","single-leg stance","locomotion"],"blocks":[{"id":"b1","type":"heading","level":2,"text":"The movement nobody looks at","anchor":"the-movement-nobody-looks-at"},{"id":"b2","type":"paragraph","content":[{"kind":"text","value":"The Movement pillar describes nine loading patterns — "},{"kind":"link","value":"squat","href":"/en/movements/squat","external":false},{"kind":"text","value":", "},{"kind":"link","value":"hip hinge","href":"/en/movements/hip-hinge","external":false},{"kind":"text","value":", pushes, pulls, "},{"kind":"link","value":"lunge","href":"/en/movements/lunge","external":false},{"kind":"text","value":", "},{"kind":"link","value":"loaded carry","href":"/en/movements/loaded-carry","external":false},{"kind":"text","value":", "},{"kind":"link","value":"rotation","href":"/en/movements/rotation","external":false},{"kind":"text","value":". It was missing the one everybody performs thousands of times a day."}]},{"id":"b3","type":"paragraph","content":[{"kind":"text","value":"This is not an inventory detail. Eight pages in this corpus point to walking to explain what a muscle is for — "},{"kind":"link","value":"tibialis anterior","href":"/en/body/muscles/tibialis-anterior","external":false},{"kind":"text","value":", the "},{"kind":"link","value":"calves","href":"/en/body/muscles/calves","external":false},{"kind":"text","value":", "},{"kind":"link","value":"gluteus medius","href":"/en/body/muscles/gluteus-medius","external":false},{"kind":"text","value":", the "},{"kind":"link","value":"iliopsoas","href":"/en/body/muscles/iliopsoas","external":false},{"kind":"text","value":" and others — without any page describing the movement itself."}]},{"id":"b4","type":"definition","term":"Gait cycle","definition":"The interval between two successive contacts of the same foot with the ground. It divides into a stance phase, where the foot is on the ground, and a swing phase, where it travels freely.","alsoKnownAs":["stride"]},{"id":"b5","type":"heading","level":2,"text":"What defines walking","anchor":"what-defines-walking"},{"id":"b6","type":"paragraph","content":[{"kind":"text","value":"A single rule separates walking from running, and it is not speed."}]},{"id":"b7","type":"evidence","level":"established","statement":"In walking, at least one foot is always in contact with the ground, and there are two periods where both feet touch the ground at once.","detail":"This is the mechanical definition used in gait analysis: the stance phase occupies around three fifths of the cycle and swing the remaining two fifths, which leaves an overlap at each change of foot. Those proportions tighten as pace increases, and double support disappears at the transition to running.","referenceIds":["perry2010","novacheck1998"]},{"id":"b8","type":"paragraph","content":[{"kind":"text","value":"That rule has a direct consequence: walking has no airborne phase. The body never falls back down, and the forces it takes stay close to its own weight."}]},{"id":"b9","type":"heading","level":2,"text":"The phases of a step","anchor":"the-phases-of-a-step"},{"id":"b10","type":"timeline","title":"One cycle, from one heel contact to the next","steps":[{"id":"t0","label":"Initial contact","timing":"0 %","description":"The heel touches the ground ahead of the body. The foot is about to go flat."},{"id":"t1","label":"Loading response","timing":"0–12 %","description":"Weight transfers onto this leg. Tibialis anterior brakes the descent of the forefoot, the quadriceps absorbs the slight knee flexion."},{"id":"t2","label":"Mid-stance","timing":"12–50 %","description":"The body passes over the planted foot. This is single-leg stance: the other leg is in the air."},{"id":"t3","label":"Terminal stance","timing":"50–62 %","description":"The heel lifts, the calf propels. The hip is at maximum extension."},{"id":"t4","label":"Pre-swing and swing","timing":"62–100 %","description":"The toe leaves the ground, the leg travels forward, and the hamstrings brake its advance before the next contact."}]},{"id":"b11","type":"heading","level":2,"text":"The problem nobody notices","anchor":"the-problem-nobody-notices"},{"id":"b12","type":"paragraph","content":[{"kind":"text","value":"At every step, for more than a third of the cycle, the whole weight of the body rests on one leg. The pelvis should then tip towards the unsupported side, like a plank set on a single pillar."}]},{"id":"b13","type":"evidence","level":"established","statement":"During single-leg stance, the hip abductors on the standing side produce the force that keeps the pelvis from dropping on the opposite side.","detail":"The mechanism is established by kinesiology and confirmed by instrumented gait analysis, which measures pelvic tilt and muscle activity through the cycle. How much residual drop remains varies between people and with speed.","referenceIds":["neumann2016","perry2010"]},{"id":"b14","type":"paragraph","content":[{"kind":"text","value":"This is the reason "},{"kind":"link","value":"gluteus medius","href":"/en/body/muscles/gluteus-medius","external":false},{"kind":"text","value":" exists, and the only occasion where that deep muscle becomes noticeable in ordinary life. "},{"kind":"link","value":"Tensor fasciae latae","href":"/en/body/muscles/tensor-fasciae-latae","external":false},{"kind":"text","value":" and the "},{"kind":"link","value":"hip adductors","href":"/en/body/muscles/hip-adductors","external":false},{"kind":"text","value":" take part in the same sideways control."}]},{"id":"b15","type":"heading","level":2,"text":"Braking more than propelling","anchor":"braking-more-than-propelling"},{"id":"b16","type":"paragraph","content":[{"kind":"text","value":"The movement looks propulsive, but most of the muscles involved work in the "},{"kind":"link","value":"eccentric regime","href":"/en/body/contraction-regimes","external":false},{"kind":"text","value":" — they hold back."}]},{"id":"b17","type":"comparison","title":"Who does what, and in which regime","columns":["Muscle","Moment in the cycle","Regime","What it does"],"rows":[{"label":"Tibialis anterior","cells":["After heel contact","Eccentric","Brakes the forefoot landing"]},{"label":"Quadriceps","cells":["Loading response","Eccentric","Absorbs the knee flexion"]},{"label":"Calves","cells":["Terminal stance","Concentric","Lift the heel and propel"]},{"label":"Hamstrings","cells":["End of swing","Eccentric","Brake the advancing leg"]},{"label":"Gluteus medius","cells":["All of single-leg stance","Isometric","Keeps the pelvis level"]}]},{"id":"b18","type":"paragraph","content":[{"kind":"text","value":"Only one of those five groups actually produces the movement. The others organise it, brake it or keep it from deviating."}]},{"id":"b19","type":"heading","level":2,"text":"Why walking costs so little","anchor":"why-walking-costs-so-little"},{"id":"b20","type":"paragraph","content":[{"kind":"text","value":"Walking is remarkably economical, and the reason is mechanical rather than muscular."}]},{"id":"b21","type":"paragraph","content":[{"kind":"text","value":"At every step the body rises slightly as it passes over the planted foot, then comes back down. It thereby trades positional energy for movement energy, like an inverted pendulum: what is gained in height at mid-stance is returned as speed at the end. The muscle only has to make up the losses."}]},{"id":"b22","type":"callout","tone":"insight","title":"What changes when running","content":[[{"kind":"text","value":"That exchange works as long as a foot stays on the ground. As soon as an airborne phase appears, the mechanism switches: the body no longer swings, it bounces, and energy is no longer exchanged but stored in the tendons. The "},{"kind":"link","value":"running","href":"/en/movements/running","external":false},{"kind":"text","value":" page describes that switch."}]]},{"id":"b23","type":"heading","level":2,"text":"Seeing the muscles involved","anchor":"seeing-the-muscles-involved"},{"id":"b24","type":"scene3d","sceneId":"carte-corporelle","title":"The deep and medial plane","intro":"The scene shows the muscles walking calls on without any outside view revealing them: gluteus medius, the iliopsoas and the adductors. Without the 3D, the logic is enough: the muscles that hold the pelvis through a step are not the ones you can see.","initialStepId":"plan-profond","accessibility":{"textAlternative":"A three-dimensional diagram of a standing human body, arms by the sides, built from simplified paper-coloured volumes. Twelve priority muscle groups are laid over this outline in terracotta: at the front, pectoralis major, the deltoid, biceps brachii, the abdominal wall and the quadriceps; at the back, the trapezius, latissimus dorsi, the erector spinae, triceps brachii, the glutes, the hamstrings and the calves. A simplified skeleton — skull, spine, ribcage, pelvis, humerus, femur and tibia — can be shown beneath the outline to reveal the bony levers these muscles pull on. Each group is selectable and opens its own reference page. This is a teaching diagram with stylised volumes, not an exact anatomical reconstruction.","structures":[{"label":"Pectoralis major","description":"A thick sheet running from the clavicle, the sternum and the upper costal cartilages to the lateral lip of the bicipital groove of the humerus. It draws the arm towards the midline and forwards, and drives horizontal pushing.","href":"/en/body/muscles/pectoralis-major"},{"label":"Deltoids","description":"Three heads — anterior, lateral and posterior — running from the clavicle, the acromion and the spine of the scapula to the deltoid tuberosity of the humerus. Together they raise the arm; separately they carry it forwards, out to the side or backwards.","href":"/en/body/muscles/deltoids"},{"label":"Biceps brachii","description":"Two heads arising from the scapula — the supraglenoid tubercle and the coracoid process — joining on the radial tuberosity. It flexes the elbow and supinates the forearm, and contributes to every pulling movement.","href":"/en/body/muscles/biceps-brachii"},{"label":"Abdominal wall","description":"Rectus abdominis, the external and internal obliques and transversus, running from the ribs and sternum to the pubis and iliac crest. They flex and rotate the trunk and, above all, stabilise the spine by regulating intra-abdominal pressure.","href":"/en/body/muscles/abdominal-wall"},{"label":"Quadriceps","description":"Four heads — rectus femoris, vastus lateralis, vastus medialis and vastus intermedius — joining through the quadriceps tendon onto the patella and then the tibial tuberosity. They extend the knee, and rectus femoris also flexes the hip.","href":"/en/body/muscles/quadriceps"},{"label":"Trapezius","description":"A diamond-shaped muscle spanning from the occiput and the cervical and thoracic spinous processes to the clavicle, the acromion and the spine of the scapula. Its upper, middle and lower portions elevate, retract and depress the scapula.","href":"/en/body/muscles/trapezius"},{"label":"Latissimus dorsi","description":"A broad fan arising from the lower thoracic vertebrae, the thoracolumbar fascia, the iliac crest and the lowest ribs, converging on the bicipital groove of the humerus. It pulls the arm down and back, and drives vertical pulling.","href":"/en/body/muscles/latissimus-dorsi"},{"label":"Erector spinae","description":"Muscular columns — iliocostalis, longissimus and spinalis — running from the sacrum and iliac crest to the ribs, the vertebrae and the skull, on either side of the spinous processes. They extend the spine and control the trunk as it lowers.","href":"/en/body/muscles/erector-spinae"},{"label":"Triceps brachii","description":"Three heads — long, lateral and medial — arising from the scapula and the back of the humerus and joining on the olecranon of the ulna. It extends the elbow, and its long head also assists shoulder extension.","href":"/en/body/muscles/triceps-brachii"},{"label":"Glutes","description":"Gluteus maximus, medius and minimus, arising from the iliac wing and the sacrum and inserting on the femur and the iliotibial tract. They extend, abduct and rotate the hip, and drive the pelvis upright in the hinge and the squat.","href":"/en/body/muscles/glutes"},{"label":"Hamstrings","description":"Biceps femoris, semitendinosus and semimembranosus, running from the ischial tuberosity to the tibia and fibula. They extend the hip and flex the knee, and control the trunk as it lowers in the hip hinge.","href":"/en/body/muscles/hamstrings"},{"label":"Calves","description":"The gastrocnemius and soleus, joining through the Achilles tendon onto the calcaneus. They plantarflex the ankle, and the gastrocnemius, which crosses the knee, also assists knee flexion.","href":"/en/body/muscles/calves"},{"label":"Rotator cuff","description":"Four short muscles running from the shoulder blade to the top of the humerus. Their tendons merge into a sheet that holds the head of the bone against its socket while the deltoid moves the arm.","href":"/en/body/muscles/rotator-cuff"},{"label":"Serratus anterior","description":"A sheet hooked onto the upper ribs by triangular slips, passing under the shoulder blade and attaching to its inner border. It holds the blade against the ribcage and rotates it.","href":"/en/body/muscles/serratus-anterior"},{"label":"Iliopsoas","description":"The only muscle linking the lumbar spine directly to the femur. It descends from the vertebrae and the iliac fossa, curves around the rim of the pelvis and attaches to the lesser trochanter.","href":"/en/body/muscles/iliopsoas"},{"label":"Hip adductors","description":"Five muscles running from the pubis to the back of the femur in overlapping layers. They draw the thigh towards the midline and control the pelvis in single-leg stance.","href":"/en/body/muscles/hip-adductors"},{"label":"Forearm muscles","description":"Masses gathered near the elbow, continued by long tendons to the wrist and fingers. They drive the hand from a distance and carry grip strength.","href":"/en/body/muscles/forearm"},{"label":"Tibialis anterior","description":"A muscle pressed against the outer surface of the tibia, its tendon swinging towards the inside of the foot. It lifts the toes on every step and brakes the forefoot after heel strike.","href":"/en/body/muscles/tibialis-anterior"},{"label":"Diaphragm","description":"A muscular dome running from the lower border of the ribs, the sternum and the lumbar vertebrae to a central tendon. As it contracts it descends, the chest gains volume and air enters: it is the engine of quiet breathing, and the ceiling of the abdominal cavity.","href":"/en/body/muscles/diaphragm"}],"steps":[{"id":"vue-anterieure","title":"Anterior view","body":"The front of the body. Pectoralis major covers the upper chest, the deltoid caps the shoulder, the biceps fills the front of the arm, the abdominal wall links the ribs to the pelvis, and the quadriceps fills the front of the thigh. Further out on the limbs, the forearm muscles drive the wrist and hand, and tibialis anterior lifts the foot."},{"id":"vue-posterieure","title":"Posterior view","body":"The back of the body. The trapezius links the neck to the shoulder blades, the latissimus dorsi fans down to the pelvis, the erector spinae flank the spine, and the triceps fills the back of the arm. Glutes, hamstrings and calves form the posterior chain from hip to ankle."},{"id":"plan-profond","title":"Deep and medial muscles","body":"Beneath the visible groups work muscles no silhouette shows. The rotator cuff holds the head of the humerus against the shoulder blade, serratus anterior keeps the shoulder blade flat on the ribcage, the iliopsoas links the lumbar spine to the femur, and the adductors fill the inner thigh. Deeper still, the diaphragm closes the trunk as a dome, inside the ribs. They orient and stabilise more than they move."},{"id":"chaine-de-poussee","title":"Pushing chain","body":"In a push, force starts at the ground, travels through the quadriceps and the abdominal wall, and then pectoralis major, the anterior deltoid and the triceps drive the load away from the trunk. The skeleton acts as the lever: no group works alone, and the quality of the movement comes from their sequencing."},{"id":"chaine-de-tirage","title":"Pulling chain","body":"In a pull, the latissimus dorsi and trapezius bring the arm and shoulder blade towards the trunk while the biceps flexes the elbow. Glutes, hamstrings and erector spinae hold the pelvis and spine so that force transfers without the trunk collapsing."}],"license":"Z-Anatomy et BodyParts3D — CC-BY-SA 4.0"}},{"id":"b25","type":"heading","level":2,"text":"What the model does not show","anchor":"what-the-model-does-not-show"},{"id":"b26","type":"callout","tone":"limit","title":"A scene cannot walk","content":[[{"kind":"text","value":"Body Lab's anatomical scenes are fixed meshes, derived from sources carrying no animation skeleton. Rotating a bone there would tear away the muscle attached to it. No scene can therefore play a step."}],[{"kind":"text","value":"This page consequently describes a movement the model only locates. The sequence in time is carried by the text and the timeline, not by the 3D."}]]},{"id":"b27","type":"heading","level":2,"text":"Common misunderstandings","anchor":"common-misunderstandings"},{"id":"b28","type":"callout","tone":"caution","title":"Three received ideas","content":[[{"kind":"strong","value":"That walking is a movement of the legs."},{"kind":"text","value":" The pelvis, the trunk and the arms take part continuously, and the most constant work in the cycle is sideways holding."}],[{"kind":"strong","value":"That speed distinguishes walking from running."},{"kind":"text","value":" What distinguishes them is the presence or absence of an instant with no support. Fast walking is still walking."}],[{"kind":"strong","value":"That one step is symmetrical and identical to the next."},{"kind":"text","value":" Instrumented analysis shows differences between the two sides in most people. Interpreting them is clinical work, not page-reading."}]]},{"id":"b29","type":"heading","level":2,"text":"Related movements and structures","anchor":"related-movements-and-structures"},{"id":"b30","type":"paragraph","content":[{"kind":"text","value":"Walking extends the "},{"kind":"link","value":"lunge","href":"/en/movements/lunge","external":false},{"kind":"text","value":", which shares its narrow-base problem, and underpins the "},{"kind":"link","value":"loaded carry","href":"/en/movements/loaded-carry","external":false},{"kind":"text","value":", which is nothing but loaded walking. On the structural side it calls on the "},{"kind":"link","value":"calves","href":"/en/body/muscles/calves","external":false},{"kind":"text","value":", "},{"kind":"link","value":"tibialis anterior","href":"/en/body/muscles/tibialis-anterior","external":false},{"kind":"text","value":", "},{"kind":"link","value":"gluteus medius","href":"/en/body/muscles/gluteus-medius","external":false},{"kind":"text","value":", the "},{"kind":"link","value":"hamstrings","href":"/en/body/muscles/hamstrings","external":false},{"kind":"text","value":" and the "},{"kind":"link","value":"iliopsoas","href":"/en/body/muscles/iliopsoas","external":false},{"kind":"text","value":"."}]},{"id":"b31","type":"heading","level":2,"text":"Sources","anchor":"sources"},{"id":"b32","type":"sourceList","title":"Main sources","referenceIds":["perry2010","neumann2016","novacheck1998"]},{"id":"b33","type":"shapierAction","actionId":"exercises-farmer-carry","label":"Walking with a load","description":"Training the loaded carry, which is nothing but loaded walking, is done in Shapier; Body Lab only explains why walking is work of control as much as of propulsion.","webTarget":"https://shapier.app/en/exercises/farmer-carry","appTarget":"shapier://exercises/farmer-carry"},{"id":"b34","type":"quiz","title":"Check my understanding","questions":[{"id":"q1","prompt":"What mechanically distinguishes walking from running?","choices":[{"id":"q1c1","label":"In walking, at least one foot is always in contact with the ground, with two periods of double support.","correct":true,"explanation":"This is the definition used in gait analysis: that overlap disappears at the transition to running, which has an airborne phase."},{"id":"q1c2","label":"The speed of travel.","correct":false,"explanation":"This is the classic received idea, but fast walking is still walking: the criterion is the presence or absence of an instant with no support, not the pace."},{"id":"q1c3","label":"The time spent on a single leg.","correct":false,"explanation":"Single-leg stance already occupies more than a third of the walking cycle, so it cannot be what defines running."}]},{"id":"q2","prompt":"Which contraction regime dominates muscular work during walking?","choices":[{"id":"q2c1","label":"The eccentric regime: most muscles brake or hold the movement back.","correct":true,"explanation":"Tibialis anterior brakes the forefoot landing, the quadriceps absorbs the knee flexion and the hamstrings brake the advancing leg; only the calves propel."},{"id":"q2c2","label":"The concentric regime, because walking is a propulsive movement.","correct":false,"explanation":"The movement looks propulsive, but only one of the five groups described — the calves, in terminal stance — actually produces it."},{"id":"q2c3","label":"The isometric regime, because the body stays upright.","correct":false,"explanation":"Only the gluteus medius works isometrically, keeping the pelvis level through single-leg stance; that is not the dominant regime of the cycle."}]},{"id":"q3","prompt":"What keeps the pelvis from dropping on the unsupported side during single-leg stance?","choices":[{"id":"q3c1","label":"The hip abductors on the standing side, including the gluteus medius.","correct":true,"explanation":"They produce the force that holds the pelvis; this is the reason the gluteus medius exists, assisted by the tensor fasciae latae and the adductors."},{"id":"q3c2","label":"The trunk and arms, which rebalance the body.","correct":false,"explanation":"The trunk and arms do take part in walking, but the force that keeps the pelvis from tipping is attributed to the hip abductors on the standing side."},{"id":"q3c3","label":"Nothing: the pelvis tips freely at every step.","correct":false,"explanation":"Without that control the pelvis would tip like a plank on a single pillar; analysis only measures a residual drop, varying between people and with speed."}]}]},{"id":"b35","type":"relatedContent","title":"Read next","targetIds":["en-movement-running","en-anatomy-gluteus-medius","en-mechanism-contraction-regimes"]}],"relations":[{"type":"uses-structure","targetId":"en-anatomy-gluteus-medius"},{"type":"uses-structure","targetId":"en-anatomy-tibialis-anterior"},{"type":"uses-structure","targetId":"en-anatomy-calves"},{"type":"explains","targetId":"en-mechanism-contraction-regimes"},{"type":"next-step","targetId":"en-movement-running"}],"authors":["equipe-editoriale-shapier"],"reviewers":["Thanh Chau"],"references":[{"id":"perry2010","authors":"Perry J, Burnfield JM","year":2010,"title":"Gait Analysis: Normal and Pathological Function, 2nd edition","source":"SLACK Incorporated","kind":"book","url":"https://www.ncbi.nlm.nih.gov/nlmcatalog/101519549"},{"id":"neumann2016","authors":"Neumann DA","year":2016,"title":"Kinesiology of the Musculoskeletal System: Foundations for Rehabilitation, 3rd edition","source":"Elsevier","kind":"book","url":"https://shop.elsevier.com/books/kinesiology-of-the-musculoskeletal-system/neumann/978-0-323-28753-1"},{"id":"novacheck1998","authors":"Novacheck TF","year":1998,"title":"The biomechanics of running","source":"Gait & Posture","kind":"review","doi":"10.1016/s0966-6362(97)00038-6"}],"review":{"publishedAt":"2026-08-02","reviewedAt":"2026-08-02","reviewDueAt":"2027-08-02","evidenceLevel":"established"},"limitations":["The proportions of the cycle described here hold for ordinary-pace walking on level ground in healthy adults. They change with speed, slope, terrain and age.","Body Lab's scenes are fixed meshes with no animation skeleton: none of them can show a step. This page describes a movement the model does not play.","Gait analysis is a clinical tool. This page describes a general functioning and allows no assessment of any particular way of walking.","A limp, pain appearing while walking or a loss of balance belongs to a health professional."],"seo":{"title":"Walking — what the body does at every step","description":"Stance and swing, double support, control of the pelvis on one leg and the role of braking: the anatomy of the most ordinary movement.","canonicalPath":"/en/movements/walking","image":"/og/en/movement-walking.png"},"app":{"offlineEligible":true},"version":1}