After tallying up the day's spark points I get out my mason jar and put in the equivalent amount of change (penny per point) into it. Better than a piggy bank - I can watch it add up!
In another jar I put in a quarter for every 30 minutes of exercise workouts I do in a day.
The money is adding up. I'm saving the quarters for running shoes. I'm not sure what the other jar's savings will go to.