Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Hip extensionprimary action
Gluteus maximus (prime mover, high emphasis); Biceps femoris long head (synergist, high emphasis); Semimembranosus (synergist, moderate emphasis); Adductor magnus (synergist, moderate emphasis)
Knee extensionprimary action
Vastus lateralis (prime mover, high emphasis); Vastus medialis (prime mover, high emphasis); Vastus intermedius (prime mover, moderate emphasis); Rectus femoris (synergist, moderate emphasis)
Spine extensionsecondary action
Erector spinae (prime mover, high emphasis); Multifidus (synergist, moderate emphasis); Quadratus lumborum (synergist, moderate emphasis)
Shoulder horizontal abductionsecondary action · resisted
Pectoralis major (synergist, high emphasis); Anterior deltoid (synergist, moderate emphasis)
Elbow extensionsecondary action · resisted
Biceps brachii (stabilizer, high emphasis); Brachialis (stabilizer, moderate emphasis)