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); Adductor magnus (prime mover, moderate emphasis); Biceps femoris long head (synergist, high emphasis); Semimembranosus (synergist, moderate emphasis); Semitendinosus (synergist, moderate emphasis)
Knee extensionprimary action
Vastus lateralis (prime mover, high emphasis); Vastus medialis (prime mover, high emphasis); Vastus intermedius (prime mover, high emphasis); Rectus femoris (synergist, moderate emphasis)
Ankle plantarflexionprimary action
Gastrocnemius (prime mover, high emphasis); Soleus (synergist, high emphasis)
Scapula elevationsecondary action
Trapezius (synergist, moderate emphasis); Levator scapulae (synergist, low emphasis)
Elbow flexionsecondary action
Brachialis (synergist, low emphasis); Biceps brachii (synergist, low emphasis)
Spine extensionsecondary action
Erector spinae (stabilizer, moderate emphasis); Multifidus (stabilizer, moderate emphasis); Quadratus lumborum (stabilizer, moderate emphasis); Rectus abdominis (stabilizer, moderate emphasis); Transverse abdominis (stabilizer, moderate emphasis)