- Fizzees are a wearable technology that combines sensors, a processor, battery and screen to track children's physical activity levels and display a virtual pet. - The virtual pet's health and development depends on the activity levels of the child based on readings from a heart rate monitor and accelerometer. - Early research with children found they enjoyed caring for their virtual pet and increased their exercise to help their pet grow, indicating Fizzees may be an effective way to motivate children to be more physically active.