Exercise has many benefits including: (1) Increased bone density, (2) Improved lung function, (3) Improved weight control, and (4) Increased blood levels of HDL (good) cholesterol which tend to clean up clogged arteries and decrease heart attack risk and stroke risk. Unfortunately, exercise also has its negative side: (1) Waste of time, (2) Discomfort and/or suffering, (3) Almost everybody quits their exercise program sooner or later. If that happens, most or all of that person's hard-earned bone benefit will soon melt away. That had been the subject of my earlier discussion on exercise: http://www.inspire.com/groups/national-osteoporosis-foundation/discussion/w hat-happens-to-our-bone-density-when-we-quit-our-exercise-program/ , and (4) Risk of injury, especially of suffering a bone fracture during exercise. How severe is the risk of bone fractures during exercise? It depends, of course, on the type of exercise you choose. Here are 3 PubMed studies that try to estimate this risk: http://www.ncbi.nlm.nih.gov/pubmed/15805341 http://www.ncbi.nlm.nih.gov/pubmed/18301977 http://www.ncbi.nlm.nih.gov/pubmed/18570539 "Stress" fractures are partial fractures that frequently occur during vigorous exercise. The following 35 PubMed studies discuss this threat that we all must face when we exercise: http://www.ncbi.nlm.nih.gov/pubmed/17414993 http://www.ncbi.nlm.nih.gov/pubmed/8673581 http://www.ncbi.nlm.nih.gov/pubmed/12768465 http://www.ncbi.nlm.nih.gov/pubmed/1415893 http://www.ncbi.nlm.nih.gov/pubmed/8638744 http://www.ncbi.nlm.nih.gov/pubmed/7955740 http://www.ncbi.nlm.nih.gov/pubmed/7496852 http://www.ncbi.nlm.nih.gov/pubmed/16306496 http://www.ncbi.nlm.nih.gov/pubmed/12392443 http://www.ncbi.nlm.nih.gov/pubmed/16643197 http://www.ncbi.nlm.nih.gov/pubmed/9302472 http://www.ncbi.nlm.nih.gov/pubmed/10997122 http://www.ncbi.nlm.nih.gov/pubmed/9238308 http://www.ncbi.nlm.nih.gov/pubmed/12663360 http://www.ncbi.nlm.nih.gov/pubmed/6385944 http://www.ncbi.nlm.nih.gov/pubmed/9166146 http://www.ncbi.nlm.nih.gov/pubmed/18757121 http://www.ncbi.nlm.nih.gov/pubmed/6886644 http://www.ncbi.nlm.nih.gov/pubmed/16271011 http://www.ncbi.nlm.nih.gov/pubmed/10399389 http://www.ncbi.nlm.nih.gov/pubmed/8407067 http://www.ncbi.nlm.nih.gov/pubmed/3720155 http://www.ncbi.nlm.nih.gov/pubmed/654891 http://www.ncbi.nlm.nih.gov/pubmed/7934016 http://www.ncbi.nlm.nih.gov/pubmed/17467861 http://www.ncbi.nlm.nih.gov/pubmed/8883216 http://www.ncbi.nlm.nih.gov/pubmed/18839145 http://www.ncbi.nlm.nih.gov/pubmed/17339282 http://www.ncbi.nlm.nih.gov/pubmed/10395437 http://www.ncbi.nlm.nih.gov/pubmed/11494836 http://www.ncbi.nlm.nih.gov/pubmed/16785578 http://www.ncbi.nlm.nih.gov/pubmed/9421865 http://www.ncbi.nlm.nih.gov/pubmed/17636110 http://www.ncbi.nlm.nih.gov/pubmed/11403117 http://www.ncbi.nlm.nih.gov/pubmed/1978620 Personally, my advice to you is to do without 100% of the maximum benefit of exercise. Try to get, say, at least one-fourth to one-third of the maximum benefit of exercise by choosing a form of exercise that is extremely convenient for you and not too time-consuming. The smart strategy here is to maximize the probability that you can keep on exercising the rest of your life without ever quitting. The other consideration is to choose a form of exercise that has virtually no chance of causing an injury or bone fracture. Typically, injuries and fractures tend to occur when people get greedy and go for 100% of the maximum benefit of exercise. If you develop even one bone fracture during exercise, you may end up wishing you could go back in time and not have exercised at all, or at the very least, you may end up wishing you had exercised in a different way.





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