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PREVENT OSTEOPOROSIS BY EXERCISING AS YOU AGE
When it comes to preventing osteoporosis, it matters little what you did when you were young, it's what you do now that counts.
In spite of this study, you still should start exercising when you are young. Good habits are usually developed when you are young. People who start exercising at an early age usually benefit by learning how to exercise. They take a harder workout on one day, followed by easy workouts until their muscle soreness disappears and they learn to take off when their muscles are sore.
Karlsson MK et al. Exercise during growth and bone mineral density and fractures in old age. Lancet 2000(Feb 5);355:469-470.