Which of the following could contribute the most in preventing or prolonging osteoporosis?

Which of the following could contribute the most in preventing or prolonging osteoporosis? 




A. girls jumping rope before puberty
B. boys running after puberty
C. middle-age women walking before menopause
D. all of the above are of equal importance


Answer: A. girls jumping rope before puberty


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Biomechanics Chapter 4

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