Eat for Health, Move for Life : The Paleo Lifestyle - Darryl Edwards

Today's workout is actually a walkout. Often over-looked for not being 'intense' enough. But our bodies were designed for walking - it is an essential locomotive motor pattern not optional or required in times of danger. Aim for 3-6 miles (5-10 km) a few times per week.

Here are some other benefits off the top of my head.

It is low impact, therefore less stress on the joints (than say jogging);
As it is a weight-bearing activity it improves bone density;
It improves mood, and mental well-being by allowing you to take time away from day-to-day stresses;
It improves circulation and has been shown to reduce the risk of cardiovascular diseases such as coronary heart disease and stroke by reducing blood fats;
It means you are likely to sit-down on fewer occasions;
It is a great recovery from an intense period of activity;
You can save money (no car or public transport required);
Easier to get your daily dose of Vitamin D with sun exposure.