I have always said if I could somehow harness the energy created by all the talking that my wife and kids do, I could solve the global energy crisis. So far there is no concept to harness the power created by flapping gums, by there is a new concept jump rope that can make power from using the thing.
The concept is called the E-Rope and it is able to generate power to charge a pair of AA batteries in each handle. The designer says 20 minutes of jumping would fully charge all four AA batteries.
After 20 minutes of jumping and most of us would be too tired to do whatever it was we needed the batteries for. The handles have a LED light to show when they are fully charged.