How about using the calories you burn while doing sports for energy efficiency? The “EnergyMe” firm uses the energy you spend with the sports equipment it created based on this question for outdoor lighting.
With this system, which is used with energy efficiency, we first contribute to the city we live in and then to our world. These and similar technologies are used today, not in the distant future.
If you happen to be in Kadıköy Caddebostan, you can see the bicycles that allow you to charge your phones on the beach and you can have this experience.
A truly Win-Win app!