No, really, it works. ;^)
I apply the same principle when I bench press. As I lower the bar I store that energy in my muscles and I then I use part of that energy to raise the bar again. By the time I'm done lifting I'm so refreshed and full of energy I usually run a marathon.
Don't worry, you'll never explain the fundamental limits of physics to someone who knows better. :)
ROFLMAO! :D