During long walks on the beach or night-time runs, this gadget is perfect for tracking burned calories. The Tractivity will track any physical activity, including distances walked, calories burned, dancing or gardening. The Tractivity Bundle includes the devices needed to track activities, such as the wearable Sensor, Lace Holder, an Ankle Band and a first-year membership to Tractivity Online. Tractivity Online is a web app that displays activity history and allows the managing and setting of personal health goals. It goes for $39.95.