Can something in your shoe make you a better athlete and prevent injury? Researchers at Purdue University in Indiana think so. They developed an insole shoe sensor. The sensor measures forces on the foot and sends the data to a computer or tablet. Athletes can use the data to improve their performance. They can reduce their chances of being injured. The sensor is small, flexible, and adjustable. It might have other uses besides sports. Maybe it can help shoe designers make better shoes. Maybe it can help people with diabetes avoid getting blisters on their feet.