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); Gluteus maximus (prime mover, high emphasis); Biceps femoris long head (synergist, moderate emphasis); Semitendinosus (synergist, moderate emphasis); Semimembranosus (synergist, moderate emphasis); Adductor magnus (synergist, low emphasis)
Hip adductionsecondary action · resisted
Gluteus medius (stabilizer, high emphasis); Gluteus minimus (stabilizer, moderate emphasis); Tensor fascia lata (stabilizer, low emphasis)
Spine extensionsecondary action
Erector spinae (stabilizer, moderate emphasis); Quadratus lumborum (stabilizer, moderate emphasis); External oblique (stabilizer, moderate emphasis); Internal oblique (stabilizer, moderate emphasis)