Doctors recommend simple walking as one of the best forms of exercise to keep us all fit and healthy at any stage of our lives. Finding the best indoor walking treadmill is therefore a great invest for young and old stay heart healthy, lose weight and generally keep in shape. Whatever the weather, you can keep up with your fitness regime on a home running machine and thanks to built in workout programs you can add enough variety to keep it fun and entertaining too. But which are the best treadmills for walking exercise? These and other questions are answered in this guide to treadmill walking fitness machines.