Pedometers have just been made obsolete by the Seiko Slimstick.
It doesn’t just count steps it has built-in dual-axis accelerometers that track the intensity of a workout to provide a more accurate readout of calories burned.
Unfortunately it is only available in Japan at the moment for around $55. It measure 0.8″ x 2.5″ x 0.35″ and weighs just half an ounce. It comes in a variety of brushed aluminum finishes: silver, pink, or gold.