I pay my sister $30 a week to work out

My sister struggles to exercise consistently. So I'm sending her $30 per week when she does. Every Sunday 23:59 pm she must have completed 3 workouts in the last 7 days (with Apple Watch proof): 💰 She earns $30 if she's on track 💸 She owes me $30 if she doesn't It's an unlimited offer, so she could make $1500/year. But if she stops the game, the offer is gone, forever.