As you age, it takes more energy to walk the same distance as it did when you were younger. But a study of joggers in their 60s and 70s suggests that older people who run may maintain their "fuel economy" longer.
Researchers at the University of Colorado Boulder found that older adults who ran at a gentle jogging pace for 30 minutes three times a week expended far less energy when walking leisurely than their peers who walked for exercise.
Not a runner? Increase the aerobic benefits of your walk by picking up the pace for a minute or two (until you breathe heavily) before easing off.
From our sister publication REMEDY's Healthy Living Spring 2015