Incorporate activity. So you can choose to add 10,000 steps a day, on a tiered system, so part of the pot goes to those who achieves the 10,000 steps a day, and part to the weight loss.
We have an update! We are currently running a StepBet Beta game that works with FitBit to encourage players to get stepping. We have thus far run two test games and hope to do another in October.
Please let us know if you have any questions.