Who remembers the Nike+ iPod Pedometer? Went in your shoe under the insole and connected to your iPod via a separate 30-pin dongle. : r/RunningShoeGeeks
Nike AMP+ WM0030 Blue iPod Nano Remote Watch | eBay
Apple Nike Amp+ Watch Remote, 3 iPod Nano Sport Kit Sensors, plus 2 Watch Bands | eBay