Originally posted by kanik
					
						
						
							
							
							
							
								
								
								
								
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		By the way, I asked a physical therapist if practicing breakfalls, like in judo, would build bone density and help prevent osteoporosis and he said it would. Bone is a living tissue, just like muscle. If you stress it, it becomes stronger. If you don't stress it, it becomes weaker. That's why astronauts lose bone density after being in space.
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