Flexes knee and extends hip (long head). Externally rotates tibia in flexed knee.
The biceps femoris contracts, flexing the knee and externally rotating the tibia in marichyasana III. This external rotation manifests as internal rotation of the hip, accentuating the twist of the trunk.
Adho Mukha Svanasana stretches and awakens the biceps femoris.
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