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 (synergist, high emphasis); Posterior deltoid (synergist, moderate emphasis); Triceps brachii (synergist, low emphasis)
Shoulder adductionsecondary action
Latissimus dorsi (synergist, moderate emphasis); Teres major (synergist, moderate emphasis)
Elbow flexionsecondary action
Brachialis (synergist, high emphasis); Brachioradialis (synergist, moderate emphasis); Biceps brachii (synergist, moderate emphasis)
Scapula depressionsecondary action
Trapezius (synergist, moderate emphasis); Pectoralis minor (synergist, low emphasis)
Spine rotationsecondary action · resisted
External oblique (stabilizer, moderate emphasis); Internal oblique (stabilizer, moderate emphasis); Quadratus lumborum (stabilizer, low emphasis)