Cardiorespiratory Fitness May Lower Your Risk of Dementia HealthlineExercising for 30 minutes improves memory, study suggests The GuardianShort-term cognitive boost from exercise may last for 24 hours, suggests study Medical XpressStaying Fit Can Keep Seniors' Brains Sharp U.S. News & World ReportExercise can boost your memory — and a new study says the short-term cognitive benefits can last for 24 hours Yahoo Life