WALKING IS THE MOST SIMPLE BUT MOST USEFUL EXERCISE.It has many advantages and is very simple .Our ancestors were aware of its advantages but they did not know the precise physical effects of walking .Modern &nbs p; medicine and doctors today make assertions about the benefits of brisk walking that have a sound basis in medical fact. Noted heart specialist Dr. Paul Dudley White said ;" it is the easiest exercise for most individuals ,one that can be done without equipment except good shoes in most terrain and weather and into very old age."He further says " A vigorous five - mile walk will do more good for an unhappy , but otherwise healthy adult than all the medicine and psychology in the wo