Don't you wish the kinetic energy used when you run could be attached to other things? Well know it can! This is an idea I got of of Daily Planet. Theirs was way better, but I wanted to make my own!
Step 1: Materials
Piece of plastic or tough material in rectangular prism form (see pic)
And last but not least:
A crank flashlight! (must be a squeeze kind)
Step 2: Expand Crank!
It's quite simple:
Glue the plastic thing on the crank.
Step 3: Put on Harness
Glue on the harness that you will strap on your leg.
Step 4: Use!
Put it on right under your knee. Now when you run, It will press the switch and generate electricity! If you want, you can find some instructions to charge cell phones and iPods with these crank lights! Here's a link:
Plus it is guaranteed you can find more than this!
Pleas vote for the United States of Efficiency contest!