Each joint action, with the role and emphasis the graph assigns each muscle. These are qualitative anatomical labels, not measured muscle activation.
Hip flexionprimary action
Iliopsoas (prime mover, high emphasis); Rectus femoris (synergist, high emphasis); Tensor fascia lata (synergist, low emphasis); Sartorius (synergist, low emphasis)
Ankle plantarflexionsecondary action
Gastrocnemius (synergist, moderate emphasis); Soleus (synergist, moderate emphasis)
Ankle dorsiflexionsecondary action
Tibialis anterior (prime mover, moderate emphasis)
Hip extensionsecondary action
Gluteus maximus (synergist, moderate emphasis); Biceps femoris long head (synergist, low emphasis)
Spine extensionsecondary action · resisted
Rectus abdominis (stabilizer, moderate emphasis); Transverse abdominis (stabilizer, low emphasis)