ElectromyographyAbdominal MusclesTorsoMuscle, SkeletalBackLumbosacral RegionMusclesMuscle ContractionBack MusclesPostureBiomechanical PhenomenaPhysical Conditioning, HumanPostural BalanceLow Back PainShoulderRectus AbdominisMovementSpineMuscle ProteinsTorqueMuscle, SmoothIsometric ContractionWeight-BearingMuscle Fibers, SkeletalMuscle, Smooth, VascularNeck MusclesMuscle StrengthLumbar VertebraeMuscle DevelopmentMuscle FatigueFacial MusclesMuscle DenervationRange of Motion, ArticularMuscle WeaknessExercise TherapyLaryngeal MusclesMasseter MuscleMuscular DiseasesMuscle Fibers, Fast-TwitchMasticatory MusclesQuadriceps MuscleMuscle Fibers, Slow-TwitchOculomotor MusclesRespiratory MusclesTemporal MuscleMyocytes, Smooth MuscleMitochondria, MuscleLegNeuromuscular DiseasesPectoralis MusclesFasciculationNeural ConductionIntercostal MusclesMuscle CrampMuscle, StriatedMuscle SpindlesMuscle RelaxationDiaphragmGaitPapillary MusclesElectric StimulationMuscular AtrophyMotor NeuronsArmKneeMuscle Cells