Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Shoulder extensionprimary action
Latissimus dorsi (prime mover, high emphasis); Teres major (prime mover, high emphasis); Posterior deltoid (synergist, moderate emphasis)
Shoulder horizontal abductionsecondary action
Posterior deltoid (synergist, moderate emphasis); Latissimus dorsi (synergist, low emphasis); Infraspinatus (synergist, low emphasis); Teres minor (synergist, low emphasis)
Elbow flexionsecondary action
Brachialis (synergist, moderate emphasis); Brachioradialis (synergist, moderate emphasis); Biceps brachii (synergist, moderate emphasis)
Scapula elevationsecondary action
Trapezius (synergist, moderate emphasis)
Spine lateral flexionsecondary action · resisted
Quadratus lumborum (stabilizer, moderate emphasis); External oblique (stabilizer, moderate emphasis); Erector spinae (stabilizer, moderate emphasis)
Wrist extensionsecondary action · resisted
Wrist flexors (stabilizer, high emphasis)