Material research: Almost all standard shoe insoles that come with shoes are made out of a piece of foam. However, specialized insoles, such as Super feet, are made out of plastic with a foam covering. Other soles specialized for heel pain have a gel cup. However, this did not help me with finding a material that would store and return energy. A couple days later, I shadowed my dad at Seattle Children’s Hospital. While I was there, I met a man named Greg Becker who was the Manager of the Prosthesis and Orthotics department. He offered me a tour of the lab and showed me some of prosthesis they have available. While we were talking, we came to the topic of running. I asked how amputees could run without their legs. Greg showed me a prosthetic called the flex-foot cheetah. It was a prosthetic leg made out of carbon fiber. Intrigued, I asked why use carbon fiber. He said that carbon fiber was very light but also very strong. In addition, it compresses like a spring which allows people to run. He said that human’s legs allow for 200 percent energy return, whereas cheetah legs only give a 90 percent energy return. But, if carbon fiber was combined with human strength, would it be able to make someone jump higher and run faster?