Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Shoulder horizontal adductionprimary action
Pectoralis major (prime mover, moderate emphasis); Pectoralis major (prime mover, low emphasis); Anterior deltoid (synergist, low emphasis); Pectoralis minor (synergist, low emphasis)
Elbow extensionsecondary action
Triceps brachii (prime mover, low emphasis); Triceps brachii (prime mover, low emphasis)
Scapula protractionsecondary action
Serratus anterior (prime mover, low emphasis); Pectoralis minor (synergist, low emphasis)
Spine extensionsecondary action · resisted
Rectus abdominis (stabilizer, low emphasis); Transverse abdominis (stabilizer, low emphasis); External oblique (stabilizer, low emphasis)