Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Knee extensionprimary action
Rectus femoris (prime mover, high emphasis); Vastus lateralis (prime mover, high emphasis); Vastus medialis (prime mover, high emphasis); Vastus intermedius (prime mover, high emphasis)
Hip extensionprimary action
Gluteus maximus (prime mover, moderate emphasis); Biceps femoris long head (synergist, low emphasis); Semimembranosus (synergist, low emphasis); Semitendinosus (synergist, low emphasis); Adductor magnus (synergist, moderate emphasis)
Shoulder flexionprimary action
Anterior deltoid (prime mover, high emphasis); Medial deltoid (synergist, moderate emphasis); Pectoralis major (synergist, low emphasis)
Elbow extensionsecondary action
Triceps brachii (prime mover, moderate emphasis)
Ankle plantarflexionsecondary action
Gastrocnemius (synergist, moderate emphasis); Soleus (synergist, moderate emphasis)
Scapula upward rotationsecondary action
Serratus anterior (prime mover, moderate emphasis); Trapezius (synergist, low emphasis); Trapezius (synergist, low emphasis)
Spine extensionsecondary action
Erector spinae (stabilizer, high emphasis); Multifidus (stabilizer, moderate emphasis); Rectus abdominis (stabilizer, high emphasis); Transverse abdominis (stabilizer, high emphasis)