A great way to measure your progress as you get in shape!

"This tiny foot pod is small enough to attach to your shoelaces or fit in  the mid-sole pocket of compatible shoes. It's always ready to use, and a  small, replaceable watch battery powers the foot pod for a year of training. Unlike simple pedometers, this foot pod uses advanced MEMS inertial-sensor technology to analyze your movements and is responsive  to stride-length changes to achieve 98 percent accuracy for speed and  distance.  Additionally, this sensor measures running cadence to help you optimize your training."