Sindre, 15, Norway - My idea is to have electric generators in all of the workout centres in the world.

Every bike in every centre could be connected to a generator.  The centres could make theie own power, and maybe enough to sell or give to others.

I want to do this because I want the next generation to have the same good life as I have.  I think that this could, maybe not save the world, but maybe it is a step in the right direction.