Many chronic health conditions can be cured, or at least diminished, through regular exercise of moderate intensity. For many people, walking on a treadmill is one of the most effective modes of exercise for several reasons.

Convenient

Treadmills are convenient to use because they require relatively little space inside your house. You can use them any time too, unlike outdoor exercise that you can only do when the weather is right.

Weight-Bearing

It is important to do weight-bearing exercises to prevent osteoporosis. L. Kathleen Mahan and Sylvia Escott-Stump state in Krause's Food and Nutrition Therapy that walking can have positive effects on bone mineral density.

Familiar

Another advantage of walking is its familiarity. You know how to walk so you do not have to learn anything. In addition, walking on a treadmill exercises some of your most important muscles--the ones that you use most often.

Precise

You can be very precise with your workouts when you use a treadmill. Most treadmills have electronic devices that tell you how fast you are going and some even tell you your treadmill's grade. If you want to walk 2 miles per hour, you will know that you are walking exactly that fast.

Reproducible

An important component of exercise training is progression. This is relatively easy when you are using a treadmill because you can keep your speed and grade consistent every day and then increase it when you feel ready. When walking outdoors, you cannot repeat the exact session until you are prepared to progress.

Source:

Krause's Food and Nutrition Therapy; L. Kathleen Mahan and Sylvia Escott-Stump; 2008