Swimming for Bone Strengthening

QUESTION: My doctor tells me I need to strengthen my bones, and suggested a
swimming regimen. However, the coach at my health club says swimming cannot
help me in this regard. Who is right?
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ANSWER: In the past, it was thought that only "weight bearing" (walking or
running) or muscle building exercises were capable of increasing bone density.
However, recent research indicates that swimming may also have a beneficial
effect. A Portland, Oregon, doctor measured bone density in the arms and
spines of 57 swimmers (who were not involved in any other form of exercise)
entered in competition for athletes over 40 years of age. Tests revealed a
significantly higher level of bone mineral content than the nonexercising
control group. While the traditional forms of exercise mentioned above are
more effective at increasing bone density, swimming doesn't carry the same
risk of physical injury--making it a perfect form of therapy for the elderly
in treating osteoporosis. While your coach has traditional thinking on his
side, your doctor has been doing his reading lately.