10,000 steps is about 4-5 miles and will typically burn around 300 to 400 calories. Studies show that a regular walking habit is good for your health.
It's better to walk a shorter distance - say 4000 steps every day than just walk 10,000 steps occasionally. For good health, walking needs to be a long-term habit.
Leave the car at home for short trips. Walk in your lunch break. Get a dog! Walk around the office if you need to speak to someone instead of picking up the phone. Meet up with friends for a walk.
A pedometer can be a good way to remind yourself to walk more. You don't need to be a slave to walking a certain number of steps a day but it can be good to have a target.