The benefit of walking is you may vary your stride style. You can always advance and vary your experience so it is never boring and you can accomplish the “whole body” experience of healthy benefits. 

One of styles you may want to try is the backward walking. The simplest way to see if this exercise might work for you is to take 10 steps forward and 9 steps backwards to see if you experience discomfort in either direction. You can practice this in your home on a flat surface to determine if this is something you would like to try outdoors. If you have no pain going forward and then backward go outdoor and find a flat area clear of traffic and walk backward for 20-30 yards. Once you can do that 5-6 times, you can look for a slight elevation and walk backward up the hill. Kids are excited when they discover they can walk backwards and have you ever seen a dog walk backward? The Tennessee Walking Show Horses proudly show off how they can go forward and then go backward. It is great exercise for man and beast. 
 
To begin a backward walking endurance program, start by walking backwards on a flat surface at a pace slightly reduced from your forward speed. This should raise your heart rate 30-40 beats per minute over your resting rate. As you feel more comfortable gradually increase your speed to match your forward pace. For an increased challenge, you can jump on a treadmill and raise the elevation level and practice walk backwards up a moderate hill backwards.

Article Source: http://EzineArticles.com/2804338