Is there any long-term problem caused by jogging on hard surfaces instead of grass or dirt? I wear good cross training shoes.
by 
RhythmBoy
ANSWERS: 1
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Yes. The lack of give in tarmac or other hard ground leads to impact stress over a period of time. The prime candidates for this are impact-aerobics instructors, many of whom became cripples before the danger was recognised. This is why tai-bo and pilates have become more popular now. The human body was not designed for the constant jarring that jogging or running produce, and your sinuvial (sorry for spelling mistake) fluid is compressed and displaced leaving the bones scraping against each other, encouraging splintering and bone growth that results in arthritis.
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