Instruction:
Is it better to run or to walk?

Response:
Deciding if running or walking depends on the environment you are in and your capabilities as a person.  The health benefits primarily of walking and running is raising the heart rate.  Consistency is key and it is better to maintain a regular walking habit then to have a sporadic running habit.  If somebody is able to maintain a regular running habit they will see the most benefit from a cardiovascular perspective.