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    Does anyone know of any studies of injuries of the lower back and its
    relationship to abdominal and leg muscle strength due to physical maturity?
    The idea is to determine if teaching methods should adapt to the physical
    maturity of the student. For example: The tennis serve in high level juniors
    involve a lot back flexion and extension, and given the lack of strength in
    the abdominal area, this could lead to lower back injury (lumbar lordosis).
    There is a tendency for juniors to flex the back for the uncoiling motion,
    instead of using leg flexion and extension (and avoid hyperextension of the
    back). A lot of this flawed technique is due to misinterpretation of what is
    seen on TV by your everyday tennis instructor.

    Jack Sujovolsky, MS., USPTA

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