Creative way to get your daughter/son to exercise

This community is created for getting feedback on the idea of getting children to exercise more by tracking their activity with a tracker and setting up rewards based on children's activity score. I made a kickstarter video here and waiting for site's approval. Before diving into building the product, I wanted to find from you whether this is something you would buy to get your kids to exercise. Your feedback will determine whether I will build this or not. Thanks! *This is not an advertisement. Also, the product does not exist.