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  2. Hamstring - Wikipedia

    en.wikipedia.org/wiki/Hamstring

    The three muscles of the posterior thigh (semitendinosus, semimembranosus, biceps femoris) flex (bend) the knee, while all but the biceps femoris extend (straighten) the hip. The three 'true' hamstrings cross both the hip and the knee joint and are therefore involved in knee flexion and hip extension.

  3. List of extensors of the human body - Wikipedia

    en.wikipedia.org/wiki/List_of_extensors_of_the...

    In anatomy, extension is a movement of a joint that increases the angle between two bones or body surfaces at a joint. Extension usually results in straightening of the bones or body surfaces involved. For example, extension is produced by extending the flexed (bent) elbow. Straightening of the arm would require extension at the elbow joint.

  4. Hyperextension (exercise) - Wikipedia

    en.wikipedia.org/wiki/Hyperextension_(exercise)

    A Roman chair helps to stabilize the legs up until the hip joints while performing low back extension. The torso from above the hip joints is flexed forwards and down towards the floor. The exercise is completed by contracting the back (erector spinae muscles) and raising the torso so the body is in a straight line from head to heels. The ...

  5. Flexion vs. Extension: What's the Difference for Your Workout?

    www.aol.com/lifestyle/difference-between-flexion...

    Flexion and extension describe the basic ways your body moves at its joints. Here's what that means for your workouts and training.

  6. Biceps femoris muscle - Wikipedia

    en.wikipedia.org/wiki/Biceps_femoris_muscle

    The biceps femoris (/ ˈ b aɪ s ɛ p s ˈ f ɛ m ər ɪ s /) is a muscle of the thigh located to the posterior, or back. As its name implies, it consists of two heads; the long head is considered part of the hamstring muscle group, while the short head is sometimes excluded from this characterization, as it only causes knee flexion (but not hip extension) [1] and is activated by a separate ...

  7. Tight hip flexors? This simple move restores mobility ... - AOL

    www.aol.com/news/tight-hip-flexors-simple-move...

    The connection to chronic hamstring tension. Tight hip flexors are a surprising but common cause of chronic tension in your hamstrings — the muscles on the backs of your legs that stretch when ...

  8. Semimembranosus muscle - Wikipedia

    en.wikipedia.org/wiki/Semimembranosus_muscle

    The semimembranosus muscle (/ ˌ s ɛ m i ˌ m ɛ m b r ə ˈ n oʊ s ə s /) is the most medial of the three hamstring muscles in the thigh. It is so named because it has a flat tendon of origin. It lies posteromedially in the thigh, deep to the semitendinosus muscle. It extends the hip joint and flexes the knee joint.

  9. Lombard's paradox - Wikipedia

    en.wikipedia.org/wiki/Lombard's_paradox

    The rectus femoris biarticular muscle acting over the hip has a smaller hip moment arm than the hamstrings. However, the rectus femoris moment arm is greater over the knee than the hamstring knee moment. This means that contraction from both rectus femoris and hamstrings will result in hip and knee extension.