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); Semitendinosus (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)
Ankle plantarflexionsecondary action
Gastrocnemius (synergist, high emphasis); Soleus (synergist, high emphasis)
Shoulder flexionsecondary action
Anterior deltoid (synergist, moderate emphasis); Pectoralis major (synergist, moderate emphasis)
Elbow extensionsecondary action
Triceps brachii (synergist, moderate emphasis)
Spine extensionsecondary action
Erector spinae (stabilizer, high emphasis); Multifidus (stabilizer, moderate emphasis); Rectus abdominis (stabilizer, high emphasis); External oblique (stabilizer, moderate emphasis)