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More studies on the amazing benefits of exercise, or activity, even light activity.  From Science Daily:

Simple tests of physical capability in midlife linked with survival

Low levels of physical capability (in particular weak grip strength, slow chair rise speed and poor standing balance performance) in midlife can indicate poorer chances of survival over the next 13 years, while greater time spent in light intensity physical activity each day is linked to a reduced risk of developing disability in adults with or at risk of developing knee osteoarthritis, suggest two papers published on bmj.com today.

The researchers conclude that there are "robust associations of standing balance time, chair rise speed and grip strength at age 53 with all-cause mortality rates over 13 years of follow-up." They suggest there is value in using these simple tests to assess physical capability in midlife to identify those people who are less likely to achieve a "long and healthy life."

In a linked paper, a team of US researchers set out to investigate whether time spent in light intensity physical activity is related to a reduced risk of developing disability and disability progression.

Their study involved 1,680 men and women aged 49-83 years free of disability, but with or at high risk for developing knee osteoarthritis, a major disability risk factor. The primary outcome was the development of disability at a two-year follow up visit. In total, participants averaged 245 minutes/day of non-sedentary activity, of which the vast majority was light intensity activities (229 minutes/day).

The results show a "significant and consistent relationship between greater time spent in light intensity activity and a reduced risk of developing disability or progression in disability," say the authors.

More details on the second study. From Science Daily:

Light activity every day keeps disability at bay