biceps-femoris220.jpgThis muscle is emphasized when performing hamstring curls while attempting to maintain the knee join in external rotation.
Biceps Femoris- Two-head major muscle of the leg. Part of the hamstrings.

Picture:
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Image result for biceps femoris picture


Origin: Common tendon with semitendinosus from superior medial quadrant of the posterior portion of the ischial tuberosity

Insertion: Primarily on fibular head; also on lateral collateral ligament and lateral tibial condyle

Action: Flexes the knee, and also rotates the tibia laterally; long head also extends the hip joint

Strengthen: Here are some example exercises to strengthen your biceps femoris:
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Image result for biceps femoris strengthening
Image result for biceps femoris exercises
Image result for biceps femoris exercises

Image result for hamstring exercises
Image result for hamstring exercises
Image result for hamstring exercises
Image result for hamstring exercises

Most exercises for this specific muscle, apply to the entire set of hamstrings.

Rehabilitation:
Just like most muscles, rehab for a tear or strain of this hamstring muscle should be followed with RICE (rest, ice, compression, elevation) and gentle stretching if there is no pain.

Interesting Facts:
The biceps femoris, semimembranosus, and semitendinosus compose the hamstrings.

Technically only the long head of the biceps femoris is part of the hamstrings. The short head is involved in knee joint flexion.

Origin - tuberosity of the ischium, linea aspera, femur
Insertion - the head of the fibula which articulates with the back of the lateral tibial condyle