I found out there's an app that gives money to charity depending on how much you run. You can choose between dozens of organizations that help stop hunger, help the homeless, cure cancer, provide vaccines to poor people, build schools, etc. I found this completely awesome and I'm totally going to use it; however, I don't know if this counts as Tzedakah because it's not me who's actually paying this, not even a cent comes from my pocket.
If you'd like to download it, it's called Charity Miles.