Walking is a great form of exercise.. i agree with the others watch your intake move your but and you will lose weight.. IMHO any exercise you feel confortable enough to do on a daily basis has to benefit you in the long run.. in the past i have lost weight with just walking alone.. but i get bored easily so now i mix it up.. walking.. elliptical. swimming.. aerobics.. mini tramp.. daily exercise makes me feel great.. its lifts my mood and helps me sleep.. if i had the choice of 3 days of 30-45 minutes walking and 7 of 15-20.. i would choose the 7.. becuase daily exercise keeps me happy..
Others might choose the 3 .. becuase that is what they prefer..
on average however i walk 3-5 days a week atm becuase its winter and an average of 60 kilometers a month
if you want to know how much you do go to www.mapmywalk.com
and sign up fill in your training log and walks everyday .. and you'll know how much you do.. I LOVE IT!