WalkingLow Back PainBack PainBackChromosome WalkingBiomechanical PhenomenaGait Disorders, NeurologicLocomotionEnvironment DesignBack InjuriesOrthotic DevicesFootPostural BalanceAnkle JointExercise TestExercise TherapyWalkersIntermittent ClaudicationElectromyographyLegAnkleTransportationCanesAccelerationShoesWeight-BearingMobility LimitationMotor ActivityRunningDisability EvaluationPostureMuscle, SkeletalCrutchesArtificial LimbsLower ExtremityTime FactorsExerciseBicyclingPain MeasurementMonitoring, AmbulatoryEnergy MetabolismRecovery of FunctionKnee JointRange of Motion, ArticularActivities of Daily LivingExercise TolerancePhysical Therapy ModalitiesQuestionnairesResidence CharacteristicsRoboticsHip JointParesisHipLumbar VertebraeAmputeesAccidental FallsPhysical ExertionExtremitiesSelf-Help DevicesPeripheral Arterial DiseaseMovementMuscle StrengthAnalysis of VariancePhysical FitnessOxygen ConsumptionHemiplegiaKneeRecreationCross-Sectional StudiesTreatment OutcomeAdaptation, PhysiologicalProspective StudiesGravitationVideo RecordingProprioceptionFollow-Up StudiesSpinal Cord InjuriesLumbosacral RegionPsychomotor PerformanceSafetyFailed Back Surgery SyndromeCerebral PalsyModels, BiologicalOrthopedic EquipmentReproducibility of ResultsLiftingQuality of LifeFoot OrthosesPeripheral Vascular DiseasesMusculoskeletal Physiological PhenomenaStrokeSeverity of Illness IndexCity PlanningLeisure ActivitiesTorsoEquipment DesignExercise Movement TechniquesFeedback, Sensory