For some forms of exercise you need to fork out on equipment, clothing or classes. Yet if you can put one foot in front of the other, you have access to a simple but free workout.
Walking is a great form of physical activity that you can build into your day as you go about your business - walk to work or school if possible and leave the car behind if you are doing errands close enough to home. Just slip on the sensible shoes (watch out for the high heels!), make sure you are visible to other people and road users and off you go.
For more on the benefits of walking - and generally being active, see the recent report from The Ramblers and Macmillan Cancer Support in England - or if you want to get the highlights so you can get out quicker for a walk, there's a summary here.