If you're particularly overweight or have joint/back or other health issues you may want to consult your physician about how to improve past a slower paced walk. But if your joints and heart are otherwise healthy, it's pretty good exercise for getting in better shape, losing/maintaining weight, and for getting to spend some time outside in the sun and fresh air.
http://www.webmd.com/fitness-exercise/guide/walking-for-exer...
http://www.mayoclinic.org/healthy-living/fitness/in-depth/wa...
If you're particularly overweight or have joint/back or other health issues you may want to consult your physician about how to improve past a slower paced walk. But if your joints and heart are otherwise healthy, it's pretty good exercise for getting in better shape, losing/maintaining weight, and for getting to spend some time outside in the sun and fresh air.