Exercise: A Guide from the National Institute on Aging About this site: Enough exercise is important at any age, but can be especially beneficial to seniors. With the right workout, you can gain strength, improve balance, and stay active and healthy longer. Experts at the National Institute on Aging developed this book (available here online) to help you realize you're never too old to get in shape! (http://www.niapublications.org/exercisebook/exercisebook.asp)   Pluses: The site offers plenty of nutrition tips, safety information and encouragement.   Minuses: It reads more like a book than a Web site.   Best feature: Most of the senior-friendly strength, balance, and stretching exercises are animated.

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