Key to vigorous retirement: Keep moving

Exercise is the key to staying vigorous in retirement, say fitness experts.

And it might also be the key to lengthening retirement by short-circuiting premature death. Lack of exercise, combined with poor dietary habits, is the second-largest underlying cause of death in the United States after smoking, according to the National Institutes of Health.

You know the routine: Regular exercise boosts energy, relieves stress, improves sleep, builds stronger bones and muscles that can help keep diseases such as osteoporosis at bay. People who exercise also protect themselves against high blood pressure, high cholesterol, heart disease and cancer.

And exercise can relieve symptoms…