Although there are several conditions which may lead to the need for knee replacement, arthritis (whether it be osteoarthritis, rheumatoid arthritis or traumatic arthritis) is the most common reason. A number of other factors contribute to joint disease including genetics, developmental abnormalities, repetitive injuries and obesity.
According to the National Osteoporosis Foundation, the best exercises for building and maintaining bone density are: 1  Weight-bearing exercise, such as walking, that makes you work against gravity while staying upright.hese studies show that people with higher levels of vitamin D have... Although people with osteoporosis may believe that exercise increases the risk of injury from broken bones, the truth is quite the opposite.
Sports like bicycling and swimming are great for your heart and lungs. However, these are not weight-bearing exercise for osteoporosis. Thatâs because you are being held up by something other than your feet and legs, such as the bicycle or the water. Walking as little as three to five miles a week can help build your bone health. For general health, most experts recommend that everyone get at least half an hour of moderate to vigorous exercise five times a week. Forty-five minutes to an hour is even better.