If you’re looking for some additional financial motivators for fitness , here are two options
Step bet : a game running for 6 weeks, each person bets $50. During each of the 6 weeks you need to have 4 “active days” and 2 "stretch days"
Each person has a personalised goal based on his recent history from a Fitbit or iOS/Android phone
From my numbers, active days are about 10% higher than my average and stretch days about 30% higher
Diet Bet : there are various games , short ones (4 weeks) and longer ones (6 months). On the long one that I joined the goal is to lose 10% of your weight.
Weight is confirmed via photos by humans. The game is separated in monthly rounds, with gradual milestones (3%, 6%, 8%, 9%, 10%, 10%) each month betting 25$ (you can drop out and not continue for the entire 6 months)