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
Walking/Running off the weight. Nike+IPod | Wearable gadgets, Fitness tracker wearable, Shoes
Amazon.com: Nike+ Standalone Sensor - One - Red : Clothing, Shoes & Jewelry