Muscle DevelopmentAbdominal MusclesTorsoMuscle, SkeletalMusclesBackLumbosacral RegionElectromyographyBack MusclesMuscle ContractionPostureMuscle ProteinsPhysical Conditioning, HumanMuscle Fibers, SkeletalPostural BalanceLow Back PainMuscle, SmoothBiomechanical PhenomenaRectus AbdominisSpineShoulderMyoD ProteinMovementMuscle, Smooth, VascularWeight-BearingMyoblastsMyoblasts, SkeletalTorqueGene Expression Regulation, DevelopmentalMyogenic Regulatory FactorsMuscle Fibers, Fast-TwitchIsometric ContractionMuscle Fibers, Slow-TwitchLumbar VertebraeMyogeninMyogenic Regulatory Factor 5Muscle StrengthMuscle DenervationMuscle, StriatedMuscle CellsMuscle FatigueEmbryo, NonmammalianCell DifferentiationPectoralis MusclesMyostatinFacial MusclesExercise TherapySatellite Cells, Skeletal MuscleMyofibrilsRange of Motion, ArticularMuscular DiseasesMyosin Heavy ChainsMyocytes, Smooth MuscleNeck MusclesMitochondria, MuscleSomitesZebrafishChick EmbryoExtremitiesPAX7 Transcription FactorOculomotor MusclesMEF2 Transcription FactorsIn Situ HybridizationMuscle SpindlesMuscle RelaxationMesodermMuscle WeaknessRespiratory MusclesMolecular Sequence DataTranscription FactorsRNA, MessengerCells, CulturedMuscular AtrophyPapillary MusclesPaired Box Transcription FactorsZebrafish ProteinsSarcomeresLarvaQuadriceps MuscleTime FactorsRegenerationDrosophila ProteinsFlight, AnimalMasseter MuscleBody PatterningBase SequenceMasticatory MusclesActinsIntercostal MusclesHindlimbSignal TransductionCell FusionDrosophilaDesminAnimals, Genetically ModifiedImmunohistochemistryGene Expression RegulationHeadMutationDiaphragm