Exercise 'keeps the mind sharp' in over-50s, study finds
Do not say you&#x27;re too busy to exercise.  Your productivity is much higher when you exercise.  
Do not say you&#x27;re too old to exercise.  The older you are, the more crucial it is.  
Get in the habit.  Start with even just 2 intense minutes a day.  Once you&#x27;re in the habit, you&#x27;ll work out longer.