15,000 steps? Not going to happen with me. I use Actifit every day (I don't post every day) to make sure my dog gets enough exercise. My doctor is pretty convinced that 7,000 steps in the desert is probably enough for me (we got 6000 this morning). It's 32C at 0730. No shot at 15k.
Good luck to you young folks.
Just tie it to the dog and see how far he goes. Between you it should get to 15k