Here's a great summary of the latest studies on how exercise helps roll back the negative effects of aging: "Fit, Not Frail: Exercise as a Tonic for Aging." In addition to stressing the ways that regular exercise helps us to maintain our strength, balance, and flexibility throughout life, the article emphasizes the ability of regular exercise to help prevent many of the chronic diseases often associated with aging. You'll also find advice about how to get started on an exercise program and links to specific exercise activities.