Exercising for half an hour at least three times a week will help to keep you on the ball, according to research carried out at the Duke University Medical Centre in North Carolina.

• 根据美国北卡罗来纳州美国杜克大学医疗中心的调查显示：每周至少三次，每次半小时的锻炼将使你的记忆处于灵敏状态。锻炼会促进血液循环，增大脑部供血量。